Mac has it good sides.
Mac is good... Excellent to be honest for making videos, webpages and for any kinda visual design. Including image creating programs (gimp, paint.net, adobe) or 3D design ( maya , 3D studio). Mac also has very little almost none, viruses,malware or any that sort. With Mac you also have possibility to use two operating systems. For excample you can use half of your memory for OS X and another half for Windows. Also when you start up your Mac computer it takes only 30 seconds to be fully up and running. Mac is designed for media purposes.
So if you are into visual designing choose Mac. If you like gaming better then choose PC.
Mac is also far more expensive.
PC (personal computer):
Pc uses Windows operating system. Pc is perfect choise for those, who are into little bit visual design and decent gaming. Pc's not as expencive as Mac but cheapes ones are absolutely uselles. From 500$+ you start to get pc that already runs smaller games with pretty good FPS ( Frames per second ). I personally wouldn't buy PC cheaper than 600$.
In a nutshell. Mac is for creative persons and Pc is for HC Gamers. Wich one you are?
I have both so if you have any extra questions, just ask them!
Peace!