The thing to do here is: Sort by rising price, note the SoC names, look them up on their respective "linux mainline kernel port progress page" (links below), and then look in the vendor sub-folders of the mainline linux Hardware compatibility list (https://github.com/torvalds/linux/tree/master/arch/arm64/boo... /vendorname/) to look for the DTS of the ODM name of the board.

Then you'll need to just figure out a way to bootstrap-boot/install Debian bullseye (ideally with the 5.15 currently in backports) on that board. Just look on the Armbian site for instructions for devices with the same SoC for that.

I have several of each of these bought over the last few years running Bullseye:

Allwinner (sunxi): https://linux-sunxi.org/Linux_mainlining_effort

Amlogic (meson): https://linux-meson.com/hardware.html#support-matrix

Rockchip: http://opensource.rock-chips.com/wiki_Status_Matrix

Similar pages can be found with "MySocName linux kernel mainline port progress" for other SoCs, if the board/family is worth considering.

Depending on your exact needs make sure to get a board with USB3, GE, (supported) Wifi/BT, (well(-ish)) supported GPU.

Just make sure, you get the final boot configuration right, or you'll start over ;)