I would definitely ask her some very specific questions before taking her to 50's PT. Given that she's be the oldest in the group (at least I'm guessing that giving what you said), there is a good chance the server will pick her to be the one that gets picked on (i.e., eat your veggies, no elbows on the table, use your napkins, don't walk with your mouthful, etc.). If she doesn't mind the ribbing, then 50PT would be okay. If she's the type that would be uncomfortable with a stranger giving her lessons in manners whether they're needed or not, I'd skip it. I went once and absolutely hated it; I was a kid and the server didn't pick on me, but I spent the whole meal worrying that they would, so it was a very uncomfortable and awful meal. The food is basic "comfort" style food.
Sci Fi, on the other hand, is a lot of fun for me. I like watching the old (and usually pretty corny/cheesy) clips from old sci fi movies. The biggest drawback is the seating. They usually set folks two a bench, so it's pretty likely that you'll be split into a two and one (you'll be in the same car, but someone will probably end up sitting alone). It makes conversation tough. If your DS is very small, they might be able to squeeze you into one row, but I haven't seen that happen to often. The food is drive-in style food (burgers, etc.). It's always been tasty and a fun atmosphere.
So for me, it's an easy choice...Sci Fi.
We also stop by before Famtasmic to pick up PBJ milkshakes from the bar. We absolutely love PT!
