Hello Jennifer and welcome back to the Disney Parks Moms Panel!
My family enjoys both of these dining venues very much. For us, it comes down to how we want to spend our dining time.
At the
Sci-Fi Drive-In Restaurant it is possible that you will be seated in cool booths that replicate even cooler retro cars. These car style booths allow excellent viewing of the drive-in movie screen that shows the best of B movie clips. While this is unique and fun, it doesn't always allow for much conversation.
On the other hand,
50's Prime Time Cafe will have you sitting around a Formica kitchen table just like the good ol' days. You can enjoy more conversation as well as the antics of your servers. Whatever you do- don't put your elbows on the table!
If conversation during your meal is important to you, I would go with 50's Prime Time Cafe. If you are looking for a truly unique experience, I would go with Sci-Fi Drive-in Restaurant.
I hope this helps with your planning. See ya real soon!
Anne