Linux distros aren’t unix. Common misconception. Mac OS is certified in fact.

Surprised about the comments. Mac OS is actually certified Unix whereas Linux distros, while wonderful, aren’t. I’ve never had to use windows for anything other than games in the 90’s so I can’t speak to it now. I’ve used Irix, then Linux, and now Mac professionally. I find Mac to be meh after Mojave. Perhaps BSD was the answer all along.