I would choose the 60's, just because of all the excitement and hope of that period. We really thought mankind was entering a better stage. (If only!) And I loved the fashions and the music.
About the 50's, I don't agree. I don't miss that period at all. Although I was just listening to a CD of The Best of Nat King Cole in my car, so I guess I have a certain amount of nostalgia.
It's in the 100's again today; it's become unbearable to even go outside. It's supposed to finally cool down on Tuesday. In my air-conditioned, very comfortable car, with Nat crooning to me, I was thinking how happy I am to be living in this decade. Imagine what life was like before air conditioning. In spite of all the sentimental memories, I'll take the current period we're living in, thank you.