I would say, whatever youre most comfortable with. Ive been using windows my whole life and i love it. Sure, there are more problems with windows than any other operating system concerning viruses, -wares, etc. This is because the majority of computer users have windows and most of these viruses, etc. are built and targeted from and to windows users. With all the different OSs out there, its harder to target them due to their different structure such as the security and file system.
I hear that Macs are good for editing, but i really hate them. ive used them in school five times and its hard to adjust to a new environment, so i just stick with windows. There is a balance for everything... If you choose Macs, you sacrifice compatibility and usability for performance and security. The decision is on you... If youre used to windows then stick with it, but if youre up to it, you can try and learn the Mac environment.