Since you mention IBM systems, I should assume that it was a very long time ago and in certain things, OSX was better than XP or W2000.
Also, take in consideration, a similar priced pc will include the same hardware as a mac with better corporate support. Actually, it might even include more hardware (memory, faster cpu, etc).
And my tone is because of the elitist attitude of apple blind followers.
Windows, Dell, whatever, are not superior. Both OS's and computers have their strength and weaknesses, but according to apple followers, that is never true.
A Xeon CPU in a Mac is the same Xeon on a Dell and both are just a computer to help you do your job, not a sacred object.