Another vote for Asrock Deskmini. I’ve had an A300 going for a while now. It started off just doing a few things on Docker, it’s now been repurposed as a Proxmox host. The nvme plus 2x 2.5” sata is very useful for storage options, and you can put some reasonable desktop CPUs in - subject to cooling, of which you can get a very low profile replacement if you need to. As there’s no video on the motherboard and no space to fit a PCIe (let alone the video card) you are restricted to CPUs with onboard video, which I think is more of a restraint for the AMD version than the intel, but even so there are enough options in the AMD lineup if you need firepower.
Another vote for Asrock Deskmini. I’ve had an A300 going for a while now. It started off just doing a few things on Docker, it’s now been repurposed as a Proxmox host. The nvme plus 2x 2.5” sata is very useful for storage options, and you can put some reasonable desktop CPUs in - subject to cooling, of which you can get a very low profile replacement if you need to. As there’s no video on the motherboard and no space to fit a PCIe (let alone the video card) you are restricted to CPUs with onboard video, which I think is more of a restraint for the AMD version than the intel, but even so there are enough options in the AMD lineup if you need firepower.