I've had the same Macbook Pro since 2006. Had the software updated and battery/charger replaced a couple of years ago. Other than that no viruses, spyware, blue screens, crashes etc...ever. My last PC was such a hassle I got sick of it. Anti-virus software alerts popping constantly, and taking forever just to boot up. Its my understanding that MAC programming is just not hacker friendly making viruses and the like less effective.
The computer world is much more MAC friendly these days, considerably more so than even just a few years ago.
MAC is the way to go.