It depends!
If you like really thrlling waterslides, Blizard beach is you place. It is still good though, if you're a wimp like me and like going on the family raft ride and the lazy river which is HUGE!
Typhoon Lagoon is good too, a nicer less plastic feel to it. Although the wave pool could be a bit dull if your on your own. However it also has some great rides, although i dont think as many.