All raspberry alternatives have the same major problem of SW support. It's always a pain to deal with.

My main NAS for about 4 years was built around a Rockchip SBC and HW video acceleration was only available on an ancient kernel version and a distro provided by the manufacturer distributed on an obscure Google Drive. I gave up on that feature and decided to run the latest Armbian release on it and it was working pretty reliably, but it was frustrating experience overall.