Let's see...XP (good)...Vista (not so good)...Win7 (good)...Win8/W8 (not so good)...Win9 (tba)
Personally, I like Vista better than XP. When we switched from XP to Vista, performance was drastically improved. Not to mention the better looks.
I got my first computer, which had XP on it, in 2003. In 2009 I loved the interface of Windows Vista, and in 2012 we got Windows Vista.
~!Donovan