All of them suck.
Apple's stuff (pcs) are too expensive and slow. Plus, Jobs killed the Newton, and Beezelbub must give him a special spot in Hell for that.
Sun? HAHAHAHAHA. Whatever. Scott McNealy is an ass, bitching about MS all the fucking time in conferences, etc. (MacUser3of5 is an ex-shareholder, and quite bitter

).
Microsoft? No comment needed. Just another lame company, although they are the biggest lame company, so I guess they get a prize.
Redhat? Couldn't care. I guess not caring is better than spite, or something...
Suse/Ximian/IBM? See above.
AOL? *cough*slow as shit*cough*
AMD? Eh. See Redhat.
Lindows!?! Only a moron could actually like Lindows. May it burn in Hell.
Basically, all companies suck, and I have no warm feelings toward any of them whatsoever. Generally speaking though, Apple Sucks Less™