Why Windows? Once you go Linux, you never come back! Some reason's would include that linux doesn't crash or freeze like Windows, more stable, more powerful, editable, performance wise it's really great. If I had a penny for every reason Linux is better than Windows, I'd buy out M$ with all my money. Let's put it that way,

Oh btw, like sweet_angel said, I don't remember last time I had to reboot while webhosting on redhat. Using Windows however, it mighta been yesterday. Lmao, just another reason.