11: manga/manhwa, bed/couch web surfing, travel
13: American/European comics, magazines, PDF markup, docked on the work desk as a supplementary device for Zoom, web browsing, chat, etc. while working on spreadsheets on the dual-monitor PC
I basically rarely use the 13 (well 12.9 M1) once I get home. That said, the Mini 6 gets far more use than the 11. I bought the 11 before I got my Mini.
Still, I find the 11 with Display Zoom set to More Space invaluable for travel for websites that don’t play nice with the Mini’s small screen. Also, it’s the 1TB model so I can dump plenty of videos on it.