I'm an System Developer and have been working with PCs and Macs for quite a while.
From an Systems perspective, the Mac OS X is an better, more robust OS than Windows. That's because it's UNIX based so it inherits all the security from that. The animations and cool graphics can have that "wow!" factor, but are not productive and setting up a Mac ban be tricky for new users, not used to the Unix commands and the sometimes very dependable on the Shell, what most of users hate.
Windows on the other hand has an history of "being the worst OS ever", but can we think why for just a moment?
Using Windows is like using your camera on the green rectangle. It won't do anything spectacular, but will get the job done without troubling you much.
Almost any setup you need to do for it to work is automatically done. Its drivers list is HUGE (WAY bigger than a Mac) and you can get some Windows 95 software and put it to run on Windows 7 and it will probably work. Try running an Mac OS 9 software on Leopard and see....
Macs are, in therms of hardware, much stronger "out of the box" than the PCs. You won't find any DELL "out of the box" PC beating up a Mac.. but on the other hand, PCs have more flexibility on that too: you won't find fingerprint readers, card readers and other things we users just love in a Mac.
Macs are known for their "top technology" hardware, like DDR3 and LED screen.. but you can get that on a PC too for less...
I myself have an PC today and just ordered an Macbook. Not because I think Mac is better but because I'm going to need one to develop for the iPhone...
But baseline here is:
- Both can show same performance, if you put equivalent hardware
- Mac OS is more robust and beautiful to use
- PCs are more productive and easier to setup.
- Photoshop and other softwares will run practically the same on similar configurations
Just my 0.02