I have used 95, 98, XP and now 7
Windows 8 and 10 are my unsolved mystery (never even tested)I've used Vista before on someones computer, I don't remember liking it much, it sure had problems playing a DVD with Media Player lol.
I just like Windows 7 best overall Reasons being... it runs really smooth, boots up fast, and doesn't require much fixing, besides my windows update "hell" issues. Ready boost works great on 1 to 2GB RAM and it has a system back image build in! It might not be as nice as Reflect but at least they try
XP had the best automatic update system, always worked fine even with a half infected system files lol.
Don't like Linux "Mint". apart from being able to use internet with it, this is the worst one I tried, runs only "okay not very fast" and had no mint flavor for me.