Oh dear. Here come the highly partisan Mac and PC fans!
Basically, you can have a good DAW using either.
The advantage of a Mac is that they very tightly control the hardware and software used which can make them more reliable. The downside is that you pay through the nose for this control. There's no doubt you get more computer for your money going the Windows/PC route, if only because there's more competition.
In my experience, I can make a PC as reliable as any Mac I've ever used just by being careful about not loading it up with tons of downloaded crap. For my DAW, I've set up a dual boot system so I can do a clean boot with no extraneous stuff running in background while doing sound work...or I can do a "standard" boot and have access to all the usual stuff including internet, wifi, anti virus and the like.
My PERSONAL preference is for PCs, both because of cost issues and because I prefer to organise my file structure in a way that fights with the Apple standard. Others like Macs.
Go with what you like and can afford. Anyone telling you that one system or the other is definitely better is letting their prejudices speak, especially now that Apple uses Intel processors.