Archinstall is not at all newbie friendly, especially compared to calamares and endeavourOS setup. Also, having a usblive is very convenient in case of problems.
If you don’t have advanced knowledge nor want to customize it very thoroughly, I don’t see any reason to use arch over endeavourOS. I mean, other than the fun of experimenting with the innards of linux, testing your frustration tolerance, and ending up being able to say “I use arch BTW”.