Ah, both parks are simply exquisite. For once, there really is very little to choose between them. It all depends on one's personal preference. If forced to choose only one, then I'd just have a look at some pictures and see which theme appeals to you most. The tropical lushness of Typhoon or the whimsical fun of Blizzard. They are both equally good parks.
Especially if you have a car, and a fast-moving family, it is perfectly doable to hop over to a water park for a few hours, and still leave much of the day for other things. Sometimes I'm in the mood for seeing lots of stuff, sometimes I want to unwind.
So you could consider seeing both parks during your trip, if only just to hop over for half an afternoon. Unless you are pressed for time. In that case, my one and only must-do golden tip for first-timers applies: you will not see it all in one trip, so do yourself a favoe and never be overwhelmed, never rush, always relax, and always give preference of the relaxed enjoyment of everybody in your family over any schedules.