If you're doing popular web-stack programming (python, ruby, node) you'll have a far better experience on a unix-based operating system since much of the tooling is designed with it in mind.

Windows has ports here and there, and there's always Cygwin, but it's going to feel like a compatibility layer the whole time you're using it (especially if you're following guides/stack overflow help).

I've used all three stacks for years and couldn't happier with my latest MBPr (hardware or software wise).

You will be a bit hosed pursuing a CS degree on Windows. People do it, you can make it work, but you'll be constantly fighting to get your system to do useful things.

I strongly preferred Windows/Linux machines for a long time until I gave in to Apple. Their machines are just superior from a hardware standpoint if cost is not highly relevant.

OSX took the intelligent step forward of basically reskinning BSD (not exactly but it's concise enough) and adopting the Intel platform on the hardware side was enough to bridge the gap and eventually overtake it in many tech circles.