50's Prime Time. It gets mixed reviews here but my family loves it. The pot roast, meat loaf and fried chicken are all terrific, exactly what you'd expect from "Mom's" kitchen. However, we've had several of their other entrees (steak, pork, etc) and all have been terrific also. The schtick is fun, although it gets old if you've been there several times, as we have. We just keep going back for the food.
We haven't been to Mama Melrose, so I can't give any info here, although I'd like to try it some time (if we can just stay out of 50's PT!). My sister took her family to Sci Fi and says "NEVER AGAIN!" Apparently the food is grossly overpriced and quality is mediocre to poor. Seems to be the general opinion of Sci Fi here on the boards. If it was my choice, I'd eliminate SciFi and then flip a coin to decide between 50's/MM!!