Ignoring freetardia which OS is the best?

Wrong. Linux on the desktop does not succumb to the same fate as Android when it comes to malware. The diversity of different distributions makes it very difficult. Malware for Ubuntu might not work on openSUSE, which won't work on Arch, which won't work on Slackware, etc.

That being said, I think the security aspect is overstated, because with windows, as long as you don't use Internet Explorer and download pr0ndownloader.exe, you should be fine.

So much this.
There's a couple versions of windoze.
To write effective malware for linux means writing at least N variations of the same thing for the major platforms, then writing N^{number of small forks, obscure distros, etc} more exceptions and special rules.
GOOD FUCKING LUCK WITH THAT.