I stumbled across a project called DietPi -- https://dietpi.com. Scroll halfway down the main page and you'll see many SBCs that it works on and might be good alternatives. Khadas are not on the list, though; I've never heard of them before now.
But my problem with all these SBCs (including VisionFive) is they max out at 8 GB of RAM. This is a problem for me because I want to run an Ethereum validator, and the software stack needs 16+ GB RAM. Is anyone aware of an SBC supporting 16 GB?
A normal computer has features I want to avoid, such as size, heat, fans, large power supplies, etc. A single-board ARM or RISC computer has all the compute power and peripheral connectors I need. The only missing piece is sufficient RAM.
Khadas Edge2 Pro has 16GB of RAM, $340 tho, available now, even from amazon.
Radxa ROCK 5B also has 16GB of RAM, $220, available via ameridroid.
Jetson Orin NX 16GB has 16GB of RAM, $600, available in Dec, would probably also require a carrier board of unspecified price.