I had alot of fun in windows 8.1, customizing it to my own liking while having a pretty fast operating system. Windows 10 is pretty nice too, but something about it just feels off. Oh and I did use windows 7 and Xp, but I think my favorite has to be 8.1.
XP is on top for sure! I've been using it for a long while. Next is ofc 7 since I look at it as a modernized version of XP .. Tho I still don't get on with 10 so far. I prefer it over the others remaining since they're quite rubbish
Kinda biased on XP. It's the longest I've used and would still use it now if not for 2 reasons:
Developers stopped supporting it.
Had to reformat some months ago.
I've used 8.1 sparingly, witnessed Vista's awfulness firsthand, and hasn't experienced much of 10 to make a good assessment. I've been using 7 for some months now, it's okay but I still miss XP terribly. Sentiments of a xenophobe...
While I do still like Windows 7, Windows 10 has been much more reliable for me in the long run. It's also surprisingly more compatible with some of my older software than Windows 7 was, so that's a plus in my book.