Yeah, there are a lot of OSs, but the only two that are widely used are Winblows and OSX.  The world runs on Windows.  Most people know of Apple computers and OSX.  People that are bashers are usually ignorant.  Im not a fan of winblows, but if it what I need to run the software I want on the hardware I want, thats what I am now going to use.  I still use OSX at work and for web, photo organization, etc.  My pc just gets the heavy lifting.  Also, for F@H, pcs are just better than Macs as far as cost and running the vga version.  I like Linux too by the way, but majority of people are not computer die hards like us.

Hopefully my F@H farm will be underway soon as donations are coming in and I haven't even announced it yet!