Whats Your Favourite OS?

Ok So We All Know Windows Vista Blows So Far.
And Linux Has Never Been Good.

But What OS Do You Consider To Be The Best?

A Couple Are Listed Below If You Need Help Thinking

Linux

Windows 9x

Windows 2000

Windows ME

Windows XP

Windows Vista

Mac OS

Solaris

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I Would Have To Say Right Now Windows XP Is The Most User Friendly But The Best, I Don't Know....

XP is the best one i ever had.

XP.

Also, why do people keep asking this question? :| 

 I too love DOS :D
I have my copy of Vista and there is way to many bugs.

In a year or so Vista will destroy just like when they first released XP, It was completely horrible, but untill they fix that I would probably say XP Media Center or 98 ( 98 is probably the most stable OS MS has ever produced )