I've stayed solo CL at GF RPC, BC, WL and BWI. From a solo chill'axing point of view I preferred WL with the lounge ambiance at RPC a close second. I enjoyed BC for the Epcot location but found the CL experience a bit frenetic with the amount of CL guests, I also really enjoy BWI solo.
From your list my favourite solo CL experience was RPC, the lounge area is one of my favourites, I enjoyed sitting listening to the band playing below. The only negative I found were the CMs, not unfriendly but they gave me the impression they felt a little sorry for me on a solo trip (one even said that to me!), my partner was playing golf on a boy's only trip in Europe at the time, he found it amusing when I spoke to him on our daily telephone call lol. I haven't stayed SL but did consider it for my solo GF CL trip, however I went with the RPC as I felt having stayed RPC with friends years previously and therefore being familiar with the lounge and main building I would prefer it over the more 'cosy' feeling of the SL CL.
It's great having the opinion of the Queen of Solo stays! That is too funny that some CMs seemed to feel sorry for you. Perhaps they were jealous?!
I'm actually not booked CL at BC as it wasn't available with the military rate. BC is the only Deluxe at which I've never stayed, so CL or not, I can cross it off the list soon. I wanted to throw an Epcot Resort in the mix and I've already done YC and BWI CLs. I've seen and heard the same reports about how crazy that BC lounge can get and that has never appealed to me at all. However, since the lounge expansion, maybe that's helped lessen the chaotic feeling.
Of your three, Tower Club was our least favorite. Most of the tower rooms are suites, so there just isn't that many guests up there. Hard to explain, but we like Atrium level better. I should also mention, to be fair, we stayed pre-renovation. At the time, renovations were sorely needed.
IMO, if you are going solo, then your experience will be slightly different form many of mine. Here's why: CR and GF both have convention space, and therefore they are used to having many business travelers. I'm sure both lounges at GF see solo guests, but the outer lounge is much closer to the convention hall. If you are there solo, people will likely think you are a business guest.
Likewise, as a solo guest, you might welcome the intimacy of the Tower lounge. Business guests are also very common in that lounge as well, and they are set up to accommodate solo guests.
We love BC. As a solo guest, you might prefer one of the back areas. The front areas - as I recall - were all four top tables.
As for the two lounges at GF...kind of personal choice. As a solo guest, you might prefer the outer lounge. We never had any trouble with noise. With the main building CL, if the musicians are playing, it isn't quiet. Our room was very quiet, but the lounge isn't quiet. Also, at ALL the MK areas deluxes, more or less- you should just assume you'll hear the water parade very clearly every night. Though you'll get less of it at GF than some of the others.
Then again, as you more or less know...all the CL's have noise. I love BC, but on our last stay, I REALLY wanted to turn off the TV's! One of them was locked on the Home and Garden channel, with the volume too loud. The 2nd was on the WDW announcement page. That was okay at first, but every time we entered the lounge, we heard the SAME 2-3 songs over and over! The kid cartoons also tend to repeat way too much!
Though neither was quite as bad as the lounge at Universal's Hard Rock. I enjoy HR music in the afternoon or evening, but I REALLY don't want it blaring at me FIRST thing in the morning! And it was BLARING! (The other US lounges are much better in the morning, IMO.)
As a solo guests, you might like the TV's as a distraction. I'm not sure. For me, I'd do my best to escape TV at WDW, except maybe weather updates. (Mostly use my phone these days.) The nice thing about CR is that you can go on the balcony or at least look out the big windows.
What a thorough and helpful post,
@mickeyluv'r! I appreciate all the points you covered. I was so excited about my first solo stay that I didn't even really think about which lounges are more conducive for singles (in the Disney traveling sense).
It's funny that what you don't really like about Tower Club, appeals to me greatly. I found the Atrium Club lounge too crowded at times and I have always been intrigued by the fact that the Tower level only has 11 suites and 5 non-suites Vs. the 12th floor's 48 rooms. I also love the 14th floor room décor.
Thanks for the TV reminder, and I know just what you mean about them being a potential negative distraction. We had a similar issue at BWI - very loud and not on a general interest channel like news, a Disney channel, Resort channel or weather. I'll probably bring my iPhone or iPad and the newspaper

. I assume there isn't a balcony on the same floor as the RPC lounge where you can sit?
WDWKOOK - I just wanted to quickly say how much I admire/appreciate the work you do on the other resort threads! Your dedication to helping your fellow Disney travelers and DIS'ers is incredibly impressive.
As to your question, I had this same internal debate prior to my Feb GF trip. In the end it simply came down to one (arguably snooty) thought/fear.... I just did not want to walk out of SL every day and look up at the main building and have that "I wonder what it's like in there" feeling. I figured GF is not a place we would go that regularly in the future, so what the heck, go big or go home. Ultimately I didn't leave RPC with a lot of Disney warm/fuzzy/magic feelings (mostly due to kind of cold CMs), but there are a lot of things that RPC does very well relative to other CLs and all things considered, we really enjoyed the stay. No regrets whatsoever. I'm not sure I could justify the very large price difference every time, but for a bucket list three day stay, heck yeah.
As to the views from RPC, I had a "Main Building-Standard Room-Club Level" room with two queens (I'm not sure if this is the same or different than your Deluxe Queen, frankly the RPC room categories kind of confused me a bit). Regardless, while I was also worried about the view, turned out I really liked it! My room category meant you either had views of the courtyard pool (which I had) OR more towards the lagoon/Poly direction. Here was my view:
@GADisneyDad14, thank you so much for your kind comments

. I really enjoy helping others to plan their trips, but I could never do any of it without all the thoughtful, kind and knowledgable people who post to the DIS Resorts forum.
I love your RPC rationale and it makes perfect sense (and isn't snooty). I'm eager to compare/contrast RPC, which is supposed to be Disney's finest CL

, with Tower Club, BWI, YC and WL CLs.
I appreciate you posting your room view - I never get tired of seeing Disney Resort photos! I always find it a pleasant surprise when staying at a MK Resort and off in the distance is another park like Epcot. It's like a bonus view
@WDWKOOK I second what
@GADisneyDad14 above said about all your hard work and great advice in resort threads!
We have stayed at most CL's multiple times each. RPC had been on my bucket list for many years. As my twins are getting older (13!), I thought now is the time to finish out that Disney bucket list before we move onto adding other trips in the mix (Alaska cruise here we come!). So this last Easter we finally stayed at RPC. I did slightly wonder if we should stay in SL instead, but in the end I had the same feelings that
@GADisneyDad14 had: would I look at the main building and wonder and wish -- most likely I would, so we went with RPC. And let me tell you, it was by far one of our best trips ever! In comparison to other CL trips, RPC was like a dream. I think a solo trip would be incredibly awesome at RPC. Just listening to the music in the main building and enjoying at your own pace = paradise! That would definitely be my choice.
We loved BC CL for many years. As a family, we have outgrown the rooms (or are at least exhausted from trying to get our requests, which are daybed, full balcony, and near lounge). However, going solo would change all that as you obviously wouldn't need a daybed. The refurbed rooms are top-notch and the new lounge is awesome! The lounge does not offer a view, and we used to love that cozy-type feeling. However, now we love having a lounge with a view, so lounges like BC and BWI aren't our favorites (right now, anyway).
So besides RPC, our other top CL experience is Poly LV. In being honest, I don't think we'd stay at Poly if we didn't stay in this type of room. It completes our experience and makes it the best it can be. We are definitely a family that spends a lot of time enjoying the resort. IMO, Poly LV and RPC both offer that relaxation along with the views and great balconies! RPC wins for the food and extra pampering touches, but Poly wins for the views and location!
Thanks so much for seconding the motion,
@TJA 
. You're a great resource for CL information and you always post thorough reviews and comments which are very helpful.
I am really looking forward to this trip. I always told myself I would do this right after DD starts college, but I kept putting off booking, until last week. It can be really hard changing gears from family vacations and never having been away one night since DD was born, to her going away to college and me traveling alone. A part of you (or at least me) is so excited and another part wonders what it'll "feel" like in reality.
I wasn't able to get a CL room at BC, but is their lounge like the Regatta Club where you have a very small balcony off the lounge where a couple of people can fit at the table?