I too prefer Pop Century to any other value. With that said, I have stayed in both the 50's and the 80's. Depending on the decade your primary guest (the one who booked the room) was born in will usually depend on which decade you are assigned. When I have traveled with my mom, we were in the 50's (sorry Mom...) and when I traveled with my husband (I was the primary) we were in the 80's.
I agree that the 50's is closer to the food court however the 80's is close to the transportation. Staying in the 80's, its just a short walk through the parking lot from the bus to your respective rubix cube.
You can always request a certain decade but you may not always get it. Any decade you stay in will be great, I assure you! Hope you have a great time.