Honestly, we've never done the water parks with our kids. The pools at the resorts are usually so fun, and we would just swim for a while, not go all day.
We always either had park hopper tickets or annual passes, so didn't get the water parks option.
My DH and I have been to both before we had kids, though, and loved TL. I liked the wave pool and the lazy river - the river may be fun, but I don't know about young kids? Also, be careful not to overdo it being pregnant.