I went to both and while I didn't have kids with me, I noticed that there were many more scared children in that age range at TL than at BB. For the K-3 age kids who are too big for the kiddie play areas, TL has more scary stuff (massive whitewater waves, underwater breathing with snorkels, slides that dunk at the end) and too few other things.
Though BB has the reputation of being the faster and wilder park, it at least has plenty of rides that younger kids can do while feeling secure -- hanging on to a raft or a parent or both. And the wave pool is more gentle and less crowded.
Plus, the family raft ride at BB is much longer and more fun, and you don't have to tote the giant raft up the hill yourself. Kids that age loved the family raft ride, and never had to give a second glance at the monster slides.