With a Raspi, you not only have Raspian/RPiOS that fully supports all models back to the first one from 2011, but a decent number of really good alternatives like Fedora, Ubuntu and special appliance variants, e.g. for console emulation etc.
In contrast, my last experiments with some other SBCs consisted of downloading some ancient ISO files of questionable provenance from some shady .cn domains. It might have gotten better, but one should carefully investigate the software situation before buying a non-RPi SBC.
The last time I made this sort of comment one of the top replies was that Pis are notoriously picky about their power supplies. Be that as it may I've not run into any trouble with my Pis (Zero W + 3B). Hence I'm using my Pis while my C1 sits unused.