My boys loved Prime Time when they were adolescents. The server made fun of their clothes, which was a riot. Nothing mean, my son wore one of those chains that looked like ball bearings, the server accused him of stealing mom's pearls. Then he asked about the punk band T-shirt and the baseball cap. The more we laughed, the more they amped it up, it was a highlight. I did notice that at tables with younger kids, the servers tended to joke with the adults more, which kids loved.
Sci Fi , on the other hand, I wasn't crazy about. The food wasn't great. When the kids were young, they sat in the front, and the server approached them first, offered them Oreo milkshakes. Of course they said yes, and we then had to tell the server not to bring the shakes. My kids were not at the age where a shake before dinner was an option. It something to watch for, because of the seating, the server approaching the kids to get their order.
Either one is fine, we thought the food at prime time was a lot better.