PCs will still be used more in businesses where all you need a word processor and a chart maker. Macs will be used more in the audio and visual fields like always.
It doesn't really matter it's just personal preference. Both companies are run by nice people who are trying to provide you with a product you need. Having a Mac won;t make you cool, and using Windows doesn't make you a cave crawling barbarian. It's just a fucking computer.
With that said I rock Windows since I like PC gaming.