Preference, but I prefer Arch for the rolling-release system and Pacman. It also doesn't come with bloat like some distros.

All three operating systems have major weaknesses, it's up to the user to decide which one won't affect him/her.

I greatly prefer Ubuntu 10.04 LTS.

Well... no one has said windows 7!
I'll say windows 7 then.

Arch Linux is my favorite.

I like ubuntu 11.04, it may be slower and less secure than the common windows 2000, but at least it can run the powdertoy

Unix 2.0

@hugoRawr
Hugo this is about the tenth time you have posted on a old thread.

I wanted to make a best OS thread, so I first searched for an already made one, I'm sorry, I didn't think anyone would mind

iOS is pretty good too