NixOS configuration is done entirely through code, so all of your packages are in a list (although that list can be spread across multiple files; it’s a bit to explain)
I’ve found it can be easier to manage what you have installed, since you can just look at that list and go “oh, why do I still have xyz installed, idek what that does anymore”
I appreciate the way things are configured a lot, but I would not recommend it unless you really like coding and you have time to tinker. It’s not too hard to get simple config setup, but I spiraled down a deep rabbit hole really quickly.
EDIT: If my comment for some reason persuaded you to use NixOS, I recommend you get a basic config setup before installing it. I’d also recommend you look at how annoying it can be to run dynamically-linked applications (i.e. you download a random executable off the Internet and try to run it, or you try to run something you downloaded with npm)
Not sure if the original image is, but this one is just an edit (look at the slightly bluer background behind the word “crazy”)