Mine would have to be Mac OS. In my opinion, it runs very smooth, theres no real worry of viruses, it's clean, very simple, easy to use and navigate through.
Though, I'm trying to learn more about Windows OS as well.
Post your opinions on your favorite/preferred OS below.
I really liked Windows 7 on my old PC that had it. It's very easy to use and quick as well. I also really like Linux, it's quite a bit faster it seems and I like the layout. The only main problem is that some things can be such a hassle on it.
"It runs very smooth, theres no real worry of viruses, it's clean, very simple, easy to use and navigate through." My how you are so very misunderstood.
My preferred OS is OpenBSD with a custom kernel.