Well, this topic covers several things, so I'll just categorize them.
Hardware: I don't know much about hardware, but it seems like most video-specialists, graphic-specialists, photographers, architects, fashion designers, and any other designers and media specialists--use Mac. I prefer Mac since I love to take pictures, play around with PS, and do other media-like things.
OS: OS X is my choice. Although, most non-major programs are either non-compatible or difficult to find in retail stores. I love everything about it. It's design and colorful-ness and all it's other cosmetic designs are the best out of all the OSs. I love everything about the OS from playing videos from just the video's icon to the expose.
I love all the pre-bundled programs on it and everything goes much faster on it than the Windows computer we have. Note: The Windows computer the same Intel Processor. It goes faster with everything and doesn't trip out when I have several programs opened (although, that's RAM. ) It also starts up really fast compared to the Vista laptops I've seen.