For over 20 years I was MS man, starting with my personal computer running Windows 3.0, later upgrading to 3.1
I've moved to MAC 3 years ago and never looked back. Not a single crash, virus etc. I own 3 MAC's at the moment, 1 desk, 1 powerbook and an old iBook G4. Everyone of them is as fast as anything out there for normal use. iBook is upgraded to 2 GB Ram. They all boot for under 30 sec. You can have any software you need.... I can't say enough good about Mac.
Still have an old IBM T42 running on XP, solely used for diagnostics but that's it.
It is a personal choice, so I respect the people running MS based machine but I am not one of them anymore.