I had use windows 7 for almost 5 years and now I am using windows 8.1 pro. Windows 7 ultimate was very nice and super fast then windows 8.User interface of windows 7 was very simple and nice, I like the Bootup animation like different colours are come round and create windows logo.
compare to the windows 8 now, for gaming I would suggest windows 7 is the best because when you play games on windows 7 you will get high Fps for games. Windows 7 used less ram then windows 8. I don’t say windows 8 is bad but compare to the windows 7. Windows 7 is the best. Both OS has a unique features.