As a dumb user I like gitlab! It's responsive, clean, legible, and pretty easy to navigate compared to others. Also anything that supports git clone because it's pretty nice for manually building stuff on arch.
I don't know what your project is or if it's going to be public but that's my vote if it is!
Even I wasn't cruel enough to banish my mother to arch. She uses fedora on her desktop (because she liked gnome) and Linux mint on her laptop because I wanted her to make sure she still wanted to switch after trying it for about a month.
She wanted to jump head first but it would have been a pain to go through four installs if she didn't like it.