The whole system is built using it, so every time your system will be the same when building from the same configuration. Even if you such to another computer, you will download locked versions of all packages and get the exact same system
In Ubuntu installing and removing a package doesn’t even guarantee it’s cleaned up
NixOS is not based on any other distro because it has its own package manager which is better than all the other distros’
Yes, that package manager will surely be the best one and not just be another one in the zoo.
The whole system is built using it, so every time your system will be the same when building from the same configuration. Even if you such to another computer, you will download locked versions of all packages and get the exact same system
In Ubuntu installing and removing a package doesn’t even guarantee it’s cleaned up