the only thing is that when you're paying 40k for a system it's sorta a moot point.. you know that 40k buys a lot of PC hardware too right??
the AVID system we used was mac, and it did rock.. but it's not especially better than a PC for the same job.. just happens that theres a certain platform dependency in that tier of work - hell up till a few years ago you would have included graphic and webdesign in with video and audio.. was the mac platform any better at graphic design tools than a PC? no.. was it just because macs were earlier to the industry and had the strangle hold? yes.