I've only been to TL-- I LOVE IT!! The theming is great-- I truly feel like I'm at a tropical paradise. I actually like the fact that you can't see the waterslides from the "main" area by the wave pool. BB to me is just to "commercial waterpark" from the photo's. However, I have been there when it's quiet (which was great!) and busy-- the one day we went a few weeks ago-- by 11am there were no "groups" of chairs to be found. Most of the slides had about a 15-20 minute wait. Now I went a few days before that-- it was empty. Never waited more than 2-3 people to get on a slide. Had the shark reef to ourselves. Only 3 other people in there!!!
Personally, we can go for the whole day, so chairs are a must for us.