[techiferous]

Here's the reason: your web server is likely to be running using Linux, so you should have some familiarity with that. If you've always used Windows, Linux will be yet another thing to learn when you get to the point of hosting your web app. If you've been using Mac OS X or Linux as your primary computer all along you'll be comfortable with it since you use it on a daily basis. With Mac OS X, you can ease yourself into Linux.

"You didn't even give a reason why OS X or Linux are better, which tells everybody you are just a zealot"

Actually, I didn't give a reason hoping that it would spark an intelligent discussion with other people sharing information about pros and cons. I was opening the topic. I can understand how it looked like zealotry and tribalism to you.