Interesting. I find paper to be far more "persistent". I have notebooks I kept in high school and college, but have lost most of the digital files from that time, or can no longer read them due to their being in a file format long dead. Corruption also plays a role, as they've moved through a variety of storage media in that time. I find digital works best for me for keeping shopping lists (that sync up with my wife, so we both know what we need and can add things), giving me reminders of appointments and time sensitive tasks, immediate communications, or as a tool for projects I'm currently on (I use org-mode heavily and particularly like its linking features for getting back to config files on remote servers, emails with instructions, etc.). All quite transitory.