Depending on what you want, OpenSUSE’s OBS is a great alternative to the AUR. It works by building software given a script, so you still just download binary packages, unlike the AUR where you download build scripts.
I honestly haven’t needed much since switching from Arch to openSUSE, though I’ve played with some OBS packages here and there. I used to maintain some AUR packages, and I haven’t needed to on Tumbleweed.
Give it a shot, you probably don’t need both. I prefer Tumbleweed these days, but I’ve used Tumbleweed and Arch both for about the same amount of time (5-ish years) and can recommend both.