You'll find lots of water park threads here, so just a quick recommendation to do a search and you'll come up with a lot of stuff.
Short answer is that I don't really think one is "better" than the other. I don't even know I'd agree BB has a better kids area. It's more obvious and clustered together, but not necessarily better. As for adults, they both offer relatively similar things. Family tube rides...the BB one can hold 6, the ones at TL only 4. Tube slides, mat slides, big slides...they both have them. TL has a roller coaster-esque tube slide in that jets of water propel you up small hills, which BB doesn't have. Both have fun lazy rivers. Both have fun wave pools, but they are VERY different. The BB wave pool is small and continuous little waves...like bobbing up and down on a raft. The one at TL has waves that come once every 2 minutes or so, but they are the most powerful wave you will likely ever experience. Definitely not for the weak swimmer if you go in more than knee deep. However, the beauty of it is that it's a zero entry pool, so even a toddler can go in...at the very far edge of the pool those monster waves have weakened into 2" gentle water movements.