I think it is really a personal preference.
For instance. My whole family uses apples. My parents for writing, my brother for his music, and my sister for The Sims.
But I just can’t get my workflow right on a mac. I find the user interface of windows mutch easier, and am able to work better.
And about the software. Most developing tools for any OS have an equivalent for an other OS. I use Notepad++ to create my websites. I believe its very similar to TextMate.
I also like the fact that i can buy a windows pc with twice the power for the same price as a mac.