What are the merits of OPNsense vs pfsense? Which one is better for which hardware (e.g. OPNsense vs pfsense on 3rd party hardware like qotom, protectli, etc), which one is better overall (pfsense on a Netware vs OPNsense on a quotom/protectli), etc.?

Also, if you were to go with a Pixel to run GrapheneOS would it be better to bite the bullet ad get the 8 or would a 7 be good enough?