Sorry Guys-
the choice is Zion. If its raining, there is so much to do and so many other crags to visit within a short drive. If it rains in the valley in spring, you're stuck. You have to drive all the way down around the Sierras to get to the east side. Plus after those big storms in the past week, the runoff on the walls will be incredible. Good for photos though.
-Pete