Yeah true..They're quite expensive but if you add all of the windows applications and accessorizes they come to about the same price
Macs are too expensive for me so I have never had a chance on them.
To be honest. Linux is the best option for me. Mac and Windows has several options for developers, but as Simon said, it is a matter of choice.
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Looking at the cost factor I would go in for PC's.
Mac is my choice. It's very innovative and it's got tons of features that PC's do not have. We have Mac's at school, so know I'm "hooked" on them.