it's a personal choice. I work on a pc cause i like it most, but some prefer mac. A lot depends also on what you are gonna do with it. Do you need a lot of PCI slots, do you know how to tune a pc/mac for musicproduction, wich is your budget, ...
but the story that a mac is more stable is bull****, a good maintained pc is more stable than the buggy standard G5's mac sells now. a trashed pc full of spyware/unwanted processes/... is it of course not, and a G5 can be tweaked also to be as stable as a good maintained pc. Everything depends on how your pc/mac is operated.
but in general the following is a generalised fact
if you don't know a lot about ICT and have a big budget, get a mac
if you're a ICT expert, and got a small budget, get a pc.
of course, this is a generalisation.