You have so many options! I have Raspberry, Banana, Mango and Orange Pi boards sat here. NanoPi, Rock Pi, Radxa, Beaglebone etc all have alternatives available too.
From the rest of the other boards it is just one kernel release (if you're lucky, 3 releases) and they have moved on to the latest SBC and dropped support and releases. The Raspberry Pi Foundation still continues to support older boards.
It just seems that with the many Raspberry Pi users, the documentation and the ecosystem built around it seems to be its success rather than the technical specs.
[1] https://homebrewserver.club/low-tech-website-howto.html#serv...