Visited the WAP last August and wish we had gone to the Zoo for the following:
a. Everything at WAP has an additional cost, seems like nothing or at least very little is included in your admission price - if you have kids this park could get pretty expensive.
b. The set-up of the exhibits do not flow, We seemed to spend alot of time backtracking in order to get out of an exhibit. It wasn't set up so you could go from one area of the Park to the other, you actually had to go all the way back from where you came from.
c. EVERYTHING seemed to be uphill, okay i know thats not possible but boy those hills were steep and I would have hated to have to push a wheel chair around this park.
d. There was also quite a bit of construction going on.
If you've been to the Animal Kingdom at DW i think you'd be disappointed in the WAP, we were - My vote would be for the zoo - have fun