Primarily you can't compare these as Apple get a monk on if you run OS X Snow Leopard or any other OS X version on anything other than a Mac system. So it isn't just a case of buying OS X and trying it, you also have to buy the Mac.
There are many arguments for and against both and that one is down to personal preference.
Me, I won't ever buy a Mac as I think they are over priced for what they are when you compare prices of Intel/PC systems, so I guess I will never get to try OS X. Aside from cost, I don't like the restrictive practices of Apple.
Ducks head back below the parapet before .: Mac :. turns up