Ok having been to both, within the same trip, just a month ago, here is where i stand between these two:
T-Rex is up here and...
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.....Rainforest cafe is down here (pretend it is much longer too)
T-Rex theme and abundance to look at is 10000x better than Rainforest Cafe. The meteor shower (frequntly occuring) is 100000x better than the basic thunderstorm Rainforest cafe has. The photo ops are 100000x more abundant and better looking.
I personally will never go to Rainforest cafe again, if it don't have to that is..
We were sat in the ice cave at T-Rex, talk about the best seat in the house, the colors where amazing.
My little sister-in-law @ T-Rex:
Little bit of the meteor shower colors changing - better in person: