Subjectively, and objectively... Mac's offer the best computers and operating software available.
Perhaps it is because I am less familiar with Mac OS (and know little about the Terminal), but I find Macs to be less flexible in customization and tweaking.
From an aethestic, engineering, and performance standpoint, nothing beats a Mac.
Aesthetic: Yes. Most definitely yes.
It wasn't until recently that AutoCAD was available for Macs. From an architect's standpoint (and some engineers?) running Parallels/Fusion/Bootcamp just to be able to run AutoCAD is more of a pain than anything. If you have a Mac, run OSX. Nothing else. Of course, as of several months ago, AutoCAD is now available for Macs.
In terms of image/video editing, Macs are also
supposedly the best. Although I am not sure what is superior about the hardware of a Mac vs a PC.
I am a long-time PC user, but I don't have any qualms with Macs. It was unsuitable for me to use a Mac through college due to the use of AutoCAD. My fiancée is a Mac user, and she has had a slew of problems with her machine. This Toshiba I bought back in 2006 has some cosmetic issues (palm prints below the keyboard) but is otherwise running strong.
I tend to think that if you take very good care of your belongings, and they serve the purpose intended, who cares if you have a Mac or PC? Computers break. Software is sometimes buggy. That's why both Macs and PCs have regular software updates.
I will say this:
I wish my Toshiba had a unibody aluminum shell with backlit keys and a smart touchpad for two-finger scrolling...
Maybe I should be a PC designer instead of an architect... Are there any good-looking PCs out there?
Josh