I've always been a PC user, and have very strong anti-mac opinions that I won't delve into too deep since a lot of it has to do with their business practices, but as far as actually USING the computers go, I'm still more partial to PC, because there's just a lot of little things about macs that bug me and have given me issues in the past (the big one being the lack of being able to set sound to mono. That may SOUND silly, but when you're deaf in one ear, and you're being asked to listen to phone conversations for the company you work for and different parts of the convo are sent to different sides of your headphones, it quickly affects your ability to work)
Honestly, though, I think you're better off just sticking with what you already know. You know how to use it already, and there are differences in how you do little things that could be annoying to get used to, and honestly, both systems are just as good as the other these days. It's been years since Macs have been better for anything outside of just having more options for art programs. So yeah, if you use a mac, stick with Macs, if you use a pc, stick with PC. The only thing I can actually say as far as reliability goes is Desktops are going to last you longer than a Laptop, so if you have the space for one, I'd recommend switching from a laptop to that. Laptops don't typically have a very long lifespan so if you're looking for something that will probably last you more than a couple years, go with a desktop regardless of OS. (A laptop CAN last a long time if you're careful with 'em, though, so I'm def not saying all laptops won't last long. Just from my own personal experience this has been the case)