I don't use any AUR packages, I don't even have an AUR helper installed ATM, If it's not in core/extra/multilib I use Flatpak. Generally I will go to Flatpak's for userland apps, Krita and Firefox are both in extra (I think?) I still use the Flatpak's for both. If I'm going to use the AUR I would generally prefer to just build from source.