My vote is for both!! My family loves both of them and would rather go there than to the theme parks.
If you like more slides (a little longer, faster, etc...) than I would say BB. To me BB feels a little more "concretey" than TL, but is still a great park.
If you like feeling like you are on a tropical island (but still with plenty of slides!) then TL. It also has a wave pool, where BB only has the bobbing pool. Also, you can swim with the sharks at TL. I think TL has a little more of a romantic feel to it (if you can say that about a park that contains thousands of people!).
Either way I recommend going to the parks first thing in the morning, the water is plenty warm. The lines are almost non-existent the first few hours! Both parks are great.
