We just did BOTH a week ago.
We really enjoyed Trex and the food was more options than RFC though both owned by Landrys Corp.
Meanwhile, not as much in the way of "show" as in RFC, its louder at RFC. Seemed to be more going on. The T Rex does a meteor show up on teh ceiling but it was not very impressive and you see all the ceiling lights, kinda silly if you ask me....
the Cave area in TRex is neat if you can sit there, it changes colors!! Your son will LOVE it.
By the way, he can also purchase (like 4.00 and up) a piece of "magma" that he'll then get to break open in a machine and Wah La a beautiful specimen inside, either purple or white crystal depending on pieces age. My son enjoyed it!!
Have a great trip....Not sure if T rex also takes advanced Reservations, but RFC does.
We enjoyed both but T rex was new for us and we really enjoyed it. And the burger was AWESOME!!!
