Arch is also just objectively better then every other option again if your goal is first and foremost gaming. Because it has by far and away the best support for new hardware and nearly every third party community tool for every game ever is on the AUR and every gaming community with modders ONLY support arch basically because of it.
EndeavourOS uses Arch's repos first and foremost, with additional stuff from their own repos on top of that, so it gets both the new hardware support you're praising, as well as AUR, and on top of that it's easier to install and maintain.
they offer some optimisations to the kernel and the packages that are supposed to yield a tiny bit better performance.
an incredibly small thing that rubs me the wrong way more than it probably should about their setup is that they set Plasma animation speeds to much higher values than the stock Plasma desktop uses. sure, it could be just a part of their customisation tweaks the same way using
fishas the default shell is, but it feels like a cheap trick to reel in the "I installed it on my desktop and it's soooo much snappier" review kind of people. like, if your work is as good as you claim, you shouldn't need to artificially make the improvements seem bigger than they really are.