Piggybacking off your comment I’ve been using SFOS as a daily driver for the past couple of years and while not perfect, it does work pretty well, somewhat of an ecosystem and it runs android apps pretty flawlessly. The UI is beautiful! If you want to get away from iOS/Android it’s a decent choice.
Some parts are closed-source tho (UI secret sauce, some Jolla apps etc). The vast majority of it is open-source though and I trust the Finnish spiritual successor to maemo/nokia a lot more than a megacorp.
Used both of these for years and years, no issues.