I don’t think regular Arch is the best for new Linux users at all but their are a few Arch based distros with graphical installers.
I’d you are trfh savvy, the Arch install process should be ok though.
Of the 2 you suggested, u would go with Kubuntu. KDE is a very popular desktop environment and Ubuntu is solid. I’ve moved distros quite a bit but always go back to Ubuntu-based. I’ve been on Mint for the last 6 or so years.
OMG now I wanna know what they said.