Plasma Bigscreen is kind of a mess still, so maybe run it on something first to understand what you’re getting into. That being said, any distro that runs KDE can run KBS, but will probably not be tuned for the least amount of resources to be used. Something like OpenELEC/LibreELEC or OSMC are very well tuned for this, and require very little in the way of resources though. I’m not saying DON’T use KBS, but if you’re lacking in resources, the others are probably a better choice.