> What would be the benefit of using RISC OS over Raspbian, or even Ubuntu Server? Is it pure nostalgia like running Windows XP on a Pi?
It's small - apps are hundreds of KB to a few MBs and it's fast/responsive. The question is what do you want to use it for? There are apps for most things, but as it's not Unix or Windows it doesn't have a lot of ports of bigger open source apps.