We've been to both - last time we walked right in at AK and got seated for lunch with no wait.
If you are part of the Rainforest Cafe club you'll save 10 or 15%, and you can walk up and get put at the front of the line if there's a long wait. Costs $15.00 but should be well worth it if you can avoid the waits.
Last meal we had pizzas - all three that we tried were great.