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