I use both Macs an PC's (Win 7-64) at work everyday. I have a couple Macbook Pro's for my office, I use a self build Windows graphics workstation at home. At work most all of my design for print (inDeign, Illustrator, PhotoShop, Acrobat) and photo editing (Capture One, PS & LR) is done on iMacs. Animation (Maya, Mudbox, 3d Studio Max), motion graphics (After Effects and some Cinema 4d), and video editing takes place on Windows workstations, with a few MacPros running Final cut. The audio guys seem to be using mostly PC's (probably different than industry trends) for q-Base and Pro Tools. The web designer/app developers seem split down the middle with a bunch of Linux fans sprinkled on top.
I find the Windows interface to be a little more efficient for file management and program navigation. I also like the access to gaming keyboards and mice for running macros in Max, Maya, Premeire and AE. I also like the way that with Windows I can assign processes to cores, so I can assign a AE render to using 4 processor cores and save two for designing stills in PS. It also is way easier to render farm with Windows boxes, so when someone is out sick or at a conference we just add their machine to the farm.
OTH, I think that OS x is a bit more stable over the long term, although a well executed Windows 7 build can be very, very stable. Windows machines seem to like to be formatted and rebuilt every couple of years to maintain optimal performance.
For consumers, I think things are a little different. Many/most off the shelf Windows PC's com stuffed with bloatware and spyware and should really be reformatted before being put to use, the work around is to use a quality local clone builder or self build.
OTOH, the Apple users seem more than happy to share any/all of their information with their beloved Apple and as such are spoon fed into the app store where they gleefully type in their credit card numbers and are happy to know that iTunes is spying on their playing habits to that the iTunes store can make better choices on what music and movies to convince them to buy.
Windows Pros
- sheer power for the buck, OTOH lately apple has gotten much more competitive
- more/cheaper/diverse accessory choices
- easier to upgrade/repair
- more/better/diverse SW and freeware, especially in games
Windows Cons
- bloat/nag/spyware from the factory
- more viruses/malware
- lose stability over time
Mac Pros
- less viruses
- stability over time
- elegant designs
- can better sync across devices, if you want to live in their ecosystem
- Apple stores and Applecare support
Mac Cons
- expensive computers
- expensive accessories
- hard to upgrade/repair
- less SW choice, especially in gaming
Linux Pros
- Stable, functional, extendable
- virtually no viruses
- Rabidly dedicated support community that will dedicate themselves to solve virtually any problem
Linux Cons
- no support for many/most of the coolest apps (PS, AE, MAx, Maya, etc) :-((