For the younger set BB has a better kiddie area, and the icebergs pool with smaller slides, lazy river and family ride were better. They both have wave pools that are different but the lazy rivers are equal. Height requirements meant that unless you carry your rings from the bottom to the top - envision everyone trying to carry their own, then the adults getting two each, it was EASIER and there were more smaller slides at BB than TL. So at TL we did the ring slides twice (DD4 and DD8), family ride twice and spent the rest of the time between lazy river and wave pool. At BB we did much more.
If you have older kids/tweens/teens it is easier and comparable at both (but the older lot prefer TL).