I have HoloISO running around on mini PCs because they just work as remote steam machines, can play games in their own right, and I can use them as media boxes if I want. I don’t necessarily recommend it, but it was super easy to install and configure except for the Bluetooth issue that cropped up occasionally where I had to unload and reload the Bluetooth module. Now I just have a script that automatically does that on boot because I can’t give a shit about fixing it.
I also have a couple of Slax USBs running around. They used to be relatively popular with folks who fixed computers. I like building from modules and I’m familiar with Slackware so it was a good fit for a live environment.