I was a Mac man for a long time as I work in the design industry, But at about '99 or so I went with windows and Ive owned:
Dell Latitude D800
Dell Precision M50
Dell XPS 1210
Sony Vaio Z.
I got the Vaio about 2 years ago - first run ordered directly from Japan was happy with it - but realized that I really didn't like windows at all.
3 months ago, got a 13" Macbook Pro - back to Mac and loving it. I have bootcamp installed but I never need it. I know depending on usage/and or budget will determine most folks final choice. But if you care for premium, the Mac is really worth it. It's the same thing with my camera equipment - I choose Nikon over Canon or Sony any day.
BTW - wow, my 500th post - only took 6 frigging years!!