HopperFan here - sorry I was at ............ DISNEY WORLD followed by vegetating on the beach. Just home.
The B resort is one of the original hotels built and built solid. The rooms are large like they used to build them. We have stayed several times, we have been in the tower facing DS, in the poolside patio rooms and in wing room that faced the parking lot and I-4. We have never been aware of any highway noise unless we were outside at the parking lot. Asking for non-connecting is always a good idea as
writerguyfl said, in any hotel, as I think that is where most noise creeps through. We love the boutique style there, the rooms are relaxing spa feel and everyone has always been extremely nice and friendly. Each trip I wish we had more down time to enjoy the pool area and dining. Always determine if your rate is inclusive or not of the resort fee and parking fee. They do run specials where they are waived - or your rate may be so low that even with those it's still reasonable. I know right now I can book as low as $71 plus fees. Not bad.
Love Doubletree as well. The newly renovated suites are well done and I love the setup of the living room and bedroom side by side. It makes the walls of glass windows so inviting. Great plan. Have faced the highway and DS. I was surprised that the highway rooms were so quiet because it is noisy at the pool which is on that side. But we rarely use the pools on our trips. Doubletree only has a parking fee.
I would stay in either one in a heartbeat and honestly, unless I needed the extra sofabed (B does have rooms with single sleeper which we liked) I would book either in a heartbeat, price would dictate. One trip I stayed at Doubletree, then POFQ, then a Marriott timeshare and finished up with B Resort.
Also check out Mousesavers, they have deals with several of these hotels that at times is the best price.
I'm glad I could help. I have lots of experience with these Disney Springs Hotels. Although I'd love to stay at a Disney resort, the cheaper prices here mean I can make my lodging dollars stretch further at one of these hotels.
^THIS. The only way I can go as often as I go is to shop the bargains while not giving up the quality I want. My last trip was ASSports, but I had zero room time, and it was the best price I found around. Disney Springs hotels are great options to "stay somewhat in the bubble" and save money. And walking to Disney Springs is a real plus especially now.