I just got back and had dinner at both. 50's Prime Time no longer offers the stuffed pepper and they had really nothing to offer vegans! The chef was really nice, just a bit clueless on what vegans eat. The pasta had egg, so my kids couldn't eat that. I got a big salad and it wasn't very good. My kids got sauteed veggies and rice, my daughter refused to eat.
Sci-Fi was awesome! The seared tofu is delicious (I ordered it without the mango sauce) and they were much more accommodating.
I hope that helps you.