Endeavour definitely has more up to date packages since it's using the Arch repos, but Fedora packages tend to be pretty up to date due to their quick release cycle.

I think it depends on the technical skill of the user. You already know things like Wayland and the concept of packages so Endeavour might not be a bad choice, but for really new users, I would still recommend Fedora. I am a diehard Arch user, but I am definitely cognizant of the fact that I am expected to know how to fix things when they break slightly due to package updates. I wouldn't say that these tasks are something I'd put onto a new user.