I do most of my web development using the terminal and emacs, so there's nothing intrinsic to OS X that's an advantage there. The real advantage of OS X is tha

I do most of my web development using the terminal and emacs, so there's nothing intrinsic to OS X that's an advantage there. The real advantage of OS X is that the rest of the system gets the heck out of your way so that you can get work done. There's a million tiny little touches in the system that make life easier, so you spend more time doing actual development instead of wrestling with the email attachment that Aunt Edna sent you. It's also the most popular *NIX out there, outnumbering everything else by an order of magnitude (or two). That means that virtually all recent UNIX software has been either been tested on the Mac, or written on one. That's nice.