We definitely prefer typhoon lagoon over blizzard beach or wet 'n' wild. Wet 'n' Wild is like a regular generic water park that has a whole bunch of slides whereas typhoon lagoon or blizzard beach has theming to it and really IMHO I just like the atmosphere and slides at the disney waterparks over Wet 'n' Wild.
Both Disney water parks are nicer than Wet n Wild. Not only in themeing, but the staff, maintenance of slides, cleanliness, etc. WnW attracts a different crowd - less families and more teens, and much smaller bikinis.
Went last year (special Florida resident rate), and will never go back.
I'm not a fan of W&W, it's showing its age now.
BUT
if you or the kids like a water park with "action" then W&W does offer an alternative as it has more to offer in this area.
If not then I'd stay away but if yes then it's worth a visit, just don't expect the surroundings to be any where near the Disney parks.