I prefer MacOS X over WindowsXP, but Windows has more and better software available for it due to its market dominance. I prefer Apple's styling, but ordinary PC stuff is much cheaper.
Linux is pretty sucky from the end user perspective, but is free. All have their pros and cons, you can set up a dual or triple boot system if you want. I am not impressed by any of the modern mainstream desktop solutions nowadays.
I think there's a severe lack of commercial competition, which results in very slow progress and lack of effort to optimise and innovate (compared to the 80s and 90s). It overall looks pretty stale to me personally with regard to general desktop OS progress.







