I am on the Windows 7 train myself. Got the chance to put windows 8 on my pc but I declined it. To be honest I find windows 8 to be more oriented towards smart phones even though it does make your pc run faster due to a lot of factors.
I am using Windows 10. I kept being prompted so I thought I had better upgrade. I must admit although it took ages to download I quite like it now that I'm used to it.
I am using Windows 7 and am pretty satisfied with the functionality and the user interface of the OS . I think Windows is still the best OS, when it comes to home PC.