If you like big giant wave pools then definately TL, if you like big giant monster water slides BB. TL also has 2 unique features, one being the Shark tank that you can kinda like snorkel in, and a water slide roller coaster. BB has one of the tallest water slides in the US the "Slush Gusher" I love both of the parks.... but for a first one time experience I would say the Shark tank takes the cake... but something about having icicles everywhere in 90 degree heat in Fl makes me kinda smile whenever I think about it, and I love the big family water slide at BB, when we get all 7 of us in one of the rafts its a hoot!! hope that helps....
Either one is a winner! Get there early if you can they usually close kinda early like 6 pm or so depending on the time of year.
MB