Digital video
Apple started claiming their superiority in digital video editing and handling with the release of their G3. We have some interesting tests that shows the mac getting beaten black and blue by a much cheaper pc-system. 

A Quick Look at the Fastest Apple PowerMac
"Basically, the 1.25 GHz dual G4 PowerMac is slower than most high end PCs (including single-processor ones)... it must be said that the Apple PowerMac does feature a very nice system chassis that provides easy access to components. "

After Effects Showdown: Mac vs. PC
"Not one of the objective tests we conducted using After Effects showed Apple's flagship machine to be superior. In fact, in most of the tests, the Mac was left lagging far behind. "

Mac vs. PC III: Mac Slaughtered Again
"So, in addition to the extra $629 you must pay for the Mac, it will cost you plenty of time as well, especially while using After Effects. Time is money. After looking at these startling benchmark results, we have to gaze over at our beautifully-designed Macs and ask, "Is it worth it?" "

Another drawback with the mac is that some of the best and most used editing programs aren't available for Mac Os.