Just back, and we bought waterpark annual passes.
I had planned to do two days at each park (and then we will use them again next year before they expire)
My kids are 10, 13, 16 and they LOVED Typhoon Lagoon so much more than Blizzard Beach. In fact, we only went to BB one day, and went Typhoon Lagoon three full days and one additional evening.
They love the shark reef, it is great to do first thing, or you can "walk" right in after six PM (the park was open until 7:30 last week).
The wave pool is completely awesome, huge waves you can ride the whole way in. You can pose for fun phototpass photos of the wave about to crash over you. We used one for our Christmas card photo last year!
The water rollercoaster, Crush N Gusher is also a lot of fun and only at TL.
I think the slides are all a bit "rougher' at TL, there is no huge body slide like Summit Plummet, but the line for that is horrendous, even at rope drop! (it is really fun, but you have to do it right away and expect to wait even then)
my experience is that BB is for younger kids, and TL is for older ones!