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.
So many options and alternatives from all of them, yet the Raspberry Pi has by far the most software support, technical support, documentation and hardware compatibility and updates compared to the alternatives.
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.
I'm still bummed about the discontinuation of the H2. Every alternative that I've been able to find with comparable specs is at least twice as expensive.