Okay Macs are not more stable. Lets get this fantasy out of everyone mind right now. Give it up they are as stable as Charles Manson.
The United States Computer Emergency Readiness Team released its year-end summary of computer vulnerabilities. While Windows is regarded as the most insecure operating system, the US-CERT found four times as many vulnerabilities specifically related to Unix and Linux. Of 5,198 reported flaws, 812 were for the Windows, 2,328 for Unix and Linux, and 2,058 more affected more than one operating system.
So as you see OS X is based off of Unix/Linux which had more flaws found last year than Windows. So everyone needs to get this fantasy out of their head that OS X is safer. It isnt. It just isnt attacked as much as XP is. Which that is changing now that they are on Intel chips.
So it all comes down to preference. XP is for gaming and video editing among other things. While OS X is mainly for video editing and someother things but no gaming.