How capable are linux based active directories, and domain controllers compared to Windows server 2016?

Im still in school in my last year of classes and im taking a microsoft certification class at the moment. I have already taken a virtualization class and a data storage class and some basic networking courses.

I have only learned about the microsoft side of things and the VMware side of things. And i have very little experience in linux and cisco. I recently only learned that linux can support domain controllers and active directory. And im curious on how capable they are.