I have never been to 50s PTC, but I do want to try it someday...
Anyhow, I faced the same dilemma when booking our trip in July. As it stands now, we have Sci Fi for lunch. I just know that Sci Fi is a cool atmosphere that our son likes, and we can get a decent milkshake, onion rings and burger. I just don't know that I will want meatloaf or fried chicken in July. I also don't know that after walking around DHS in July all day that I will want some waiter harassing me (on the other hand, if the waiter doesn't harass us, then what was the point

). Going into a cool, dark place in July with a neat atmosphere is what sold me.