It depends, if you want an actual computer experience, go with Windows 7 but if you want a giant tablet experience. Go with Windows 8.
Youtube has lots of Windows 8 reviews (personally I think Windows 7 is a lot better)
I prefer Windows 7 myself for gaming but 8 isn't too bad either. You might want to hold off a month or so until Windows 10 is launched. I did some beta-testing on 10 and it would play any of the games I had on 7 just fine. I beta-test games for a company, so I know how well they all work. 7 for now but 10 is even better.
I strongly suggest that you get Windows 7 because most games are released with Windows 7. But if you want a faster OS and a new interface, get Windows 8.
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I unequivocally recommend that you get Windows 7 on the grounds that most recreations are discharged with Windows 7. In any case, on the off chance that you need a quicker OS and another interface, get Windows 8.