We have tryed both and enjoyed Sci-Fi better.
We had two Teen Boys and they loved sitting in the
cars at Sci-Fi.
We didn't enjoy the skit of pretending you are related to
people who you don't like (50's PT)--that's why we went to WDW to
get away from annoying family members--just like the Twilight Zone.

My food was good at both places.
At Sci-fi our waiter was most accomidating--he got my DS
a Veggie burger at lunch when it was not on the menu--
very good at his job. We let the teens sit in the 1st seat of the
car (they were 13 yrs old at the time, and thought it would be cool to drive).
Plus at the end of your meal the server will give the Ticket (driving/dining)
to the person sitting in the drivers seat (the teens got a kick out of that).
Loved the crazy B Rated Sci-Fi movie Clips.

Have a fun trip!