I prefer windows 10 myself, although if you are to choose between Win 8 or Win 7, I'd say Win 8. I'm currently using windows 7 on my school computer, due to my smarthat brother having issued a Alienware formating disc causing the windows key to be made 'fake' or something alike, and windows 10 on my PC at home. I used to have windows 8 before windows 10, and both those versions are much better.