Quality Developers
I have always felt that perhaps the biggest advantage to using Apple hardware is the rich market of quality independently developed software. There are so many apps on the Mac that simply don't exist for Windows. These independent developers are dedicated to making quality software and without them, I'd be much less likely to use Apple's hardware. Today is the 25th anniversary of the Omni Group but Omni's not alone. Michael Tsai points out that a lot of our favorite apps have been around awhile. My favorite post on this subject was Jason Snell's, Built to last.