BB has great kids' stuff - Tike's Peak is for kids under 48" (or something like that) and has shallow water, and then Ski Patrol has stuff for bigger kids and has swimming-depth water. The wave pool at BB is much calmer and won't slam you around like TL's does most of the time, and the lazy rivers are pretty similar except for the theming.
I don't know that there's much your husband could actually go on with the kids at either of the water parks - I don't think adults are allowed on the kids' slides with them (I could be wrong but I don't think I've seen it happening). There is a family raft ride in each park - I've never been on either one (I'm a solo traveler and water slides with strangers is weird for me, lol), but based on videos I've seen, they might be a bit too intense for a 3-year-old (but I could be wrong here too, as I interact with very few 3-year-olds). For what it's worth, I've heard BB's is better.
BB also has some great thrill slides if your husband is interested in doing those on his own.
So yeah, I personally prefer TL, but if I had kids I'd go to BB.