I have all OS.
I own a MacBook Air, a dedicated computer acted as a server, a gaming desktop and a laptop(it's actually my dad's).
MacBook Air use...well what else
. I use it mainly for traveling and show off.
Server have both Window Server 2008 and Ubuntu Desktop(I don't know how to use command line >.< )
Gaming Desktop have XP Pro but recently installed Vista Premium.
Laptop have Window Vista Home Basic and going to upgrade to Window 7.
I don't choose OS base on their look but their performance. But recently Linux is much much more stable than Window and it even look a lot better.
If a lot of games are made for Linux, I would install Linux on all my computer.
Sincerely,
Rithy