Thankfully, the OS can be easily changed (And, that’s voluntary). The only real difference hardware wise, is the cover at the back with the manjaro branding. Something that you can easily replace with a blank one on their store. I personally prefer UBports, I don’t like pureOS UI (Can’t remember how it is called). SailfishOS is nice too, but the UI is closed-source, and doesn’t get a lot of dev support.