My absolute favourite is the BWI CL, the CMs are exceptional and I prefer the lounge, it's roomy and has some very comfortable sofas to relax in, I also (just my opinion) feel it has more of an adult vibe.
I stayed at the BC CL last December on an adult solo trip and I now have a second favourite. Whilst I found the lounge small and not really set up to relax in (only 2 'comfortable' chairs, the rest are tables/chairs to eat/drink at) I just used to take my breakfast back to my room to eat on the balcony, all the CMs were lovely and I loved the feel/buzz of the resort. Going by what I'd read on the dis I'd expected more families/children at the BC CL but there was an equal mix of young couples/older couples/families as well as some convention attendees.
I've also stayed at the YC CL which I enjoyed but found the lounge equally as 'small' as the BC lounge.