NixOS is a bad choice for a new user. EndeavourOS is okay, but arch-based distros (even ones with nice graphical installers) can get overwhelming for a beginner if an update breaks something and you have to figure out why and fix it, which isn't an irregular occurence for me. Wouldn't recommend tumbleweed for similar reasons.
I think the best mix of easy customizability, beginner-friendliness, and stability are probably offered by fedora and mint, personally.