Not really a choice right now. Typhoon Lagoon has yet to reopen and is (apparently) going under major repairs. No one knows when it will reopen.
They both have advantages over each other. BB probably has more overall slides, is consider better for kids because of the larger play area and a milder wave pool; TL has more unique attractions like Crush n' Gusher water coaster and Miss Adventure Falls. But our favorite part of TL was diving in the now-gone Shark Reef.