I’ve used lots of different boards. The Radxa Rock 3c is cheap and has decent performance, but the official OS support is a bit old. The Libre Computer boards are also good and have Armbian support. Libre Computer is releasing a couple more this year too. BananaPi has good options that aren’t expensive, like the BananaPi M5. Friendly Elec has some boards like the NanoPi R2C and R5C that aren’t pricey and have Armbian support. Any one of these boards are fine for a small home lab. Just boot Armbian, install Docker, and add your containers.