I've had experience with Mac, Windows, and Linux, and they all have their weakpoints and strongpoints. If you are thinking about getting one or the other, then you will like this review!
Mac:
Pros: The mac has a very good OS system. It is all built together so it all works together. It is also very good with media editing, and it comes with great software. It has a large cool factor as well.
Cons: You can only get mac by buying their computer, which may not have what you want on it.
Windows:
Pros: Has a lot of software available. One of the most easiest to learn, and is very popular, so help is easy to find.
Cons: Not much free software, and it is not a very reliable system. You can't change the interface very easily either.
Linux:
Pros: Extreamly reliable server and system. Very fast, and can be used on vitually all systems. 99% of the software is free as well.
Cons: Hard to install programs because of all the dependancies. Hard to learn how to operate to it's full extent.
What would I recommend? None, because it all depends on your needs. If you are going for a simple interface just to read email and write documents, go with Windows. If you need video and picture editing, go with Mac. Need a server? Go with Linux.

