I've used them all, but at the moment I use Windows until I find a job then I'll get me a new Mac Desktop to have some fun with...
I Use XP every day. I also use virtual servers for everything else. VMware is letting people download server and vmware player. You can get predefined systems you can use in it. I have a nice Debian Linux VM system I downloaded. Just make sure you have lots of memory.
Keith, go for it! I'm typing this on my new MacBook Pro laptop (2GHz with two gigs of RAM and Mac OS 10.4). Everything is great. It runs circles around the PC laptop I had been using at the office. Pretty pricey, but worth it.
Windows. Ran OS X on a PC for a few days, but probably won't be running OS X again until I do it on a real Mac.
I will when I get some cash... I used both Mac's & Pc's for years at my last job... I like the ease of fixing things like the OS, programs and hardware on the Mac's better than I do on the PC's... But they both have a use for me...
I use windows XP but I would like to have a dual OS computer... windows XP and the other one is Linux
I use OSX since the start of this year and I don't regret it, I wish I would have realized how much windows sucks before. I tried intalling linux on a toshiba laptop, but it's just too crappy for anything other than windows (propietary hardware or BIOS or something like that)