Whats the Best OS?

The best OS is the one you know and the one you're most comfortable with. In my opinion the best OS's for me are WindowsXP / Windows7 / Debian / Backbox / Knoppix The worst OS's are Windows Vista and Corel Linux. as seen with the red stop color. lolz
WindowsXP was the best until it was laid to rest. It was stable and a definite good upgrade from Windows2000 and earlier Windoze OS's
Windows7 was the best out of Vista and Win8. I still use it today.
Windows10 I'm not a fan because of the invasion of privacy plus the terms & conditions of the user agreement. I won't be using it until Win7 gets tossed aside and when I do "downgrade" to it I'm going to heavily modify it and keep it offline as much as possible. I have what I think are very good reason's for that.
Debian is on the top 5 list of awesome its the Linux distro I know best.
Knoppix is another favorite Debian based distro that I think is really good.
Backbox is my current all time favorite Linux distro that is spawned from Ubuntu. Its over all a Debian based OS. Has everything I want and need plus more. It is the most awesome distro.
Corel Linux Is the worst Linux OS ever in my opinion and it was the very first experience with Linux I had. It came out of the package broken and didn't play well with the hardware I was using at the time. It liked older boxes. Its a good thing they discontinued that piece of shit OS after 1 year.
Windows Vista is a sluggish bloated piece of crap that sucks dirty sweaty ballz.