After more than 20 years of systems switching / distro hopping etc etc. I would be INCAPABLE of saying what I prefer the most. I tend to find I can get used to anything and when that's the case, my opinion on the other environments change too...
So, at a time I was in love with AOS 3.x, with MorphOS, with BeOS, with OSX ; now I'm rather a Linux guy and I'm quite of fan of KDE (which customizability is similar to what I loved with AOS+MUI)... Also sometimes I love the look of x, y, or z, but end up finding it's unpractical...
So, I couldn't say but if I have to tell what, at one time or another, left me a strong impression I would say :
- end of 80s : Atari GEM / classic MacOS
- early nineties : AmigaOS
- end of nineties : BeOS / GNOME / Afterstep
- beginning of 2000 : MorphOS & OSX
- end of 2000 / now : KDE (Linux)
Edit : ah yes, Ambient/MorphOS was forgotten in the poll ; important choice IMHO
