RPi 5 & Umbrel 1.0, Build or Flash?

Slightly confused (my normal state) about whether I should use the flash build process or do a manual install using the more generic Linux source for my new RPi 5? I don’t see why I can’t use the flash process but it says it’s for the RPi 4 (at least that’s what I see). Can you clarify if the flash/Etcher image is the best for a new RPi 5 or should I build using the generic Linux process to get the best performance?

Go to:

and follow the instructions.
I took balenaEtcher and it was ready after one minute maybe.