I don't think that currently there is much difference in terms of performance, unless you are using a very bloated distro.

Personally I prefer Arch compared to Ubuntu, Fedora or similar (including Endeavor, Manjaro etc...) because I simply want to build my OS, piece by piece.

There is basically nothing else about it, I just like feeling the system I am running as something I created (kinda) and knowing exactly what is running and why it's there.

Obviously you could achieve the same with other distros (and even go deeper with things like Gentoo or Guix) but Arch makes it very easy to do it.

EDIT: oh and being rolling release too, as another user mentioned. I would never go back to a fixed release distro.