More features, no rakuten tracking, advanced gestures, UI customization, file system access, sleep, advanced progress tracking and sync, cloud sync, wallabag (self hosted mozilla pocket), RSS/OPDS feeds and more, read more on their website, pretty easy to get started with however if you care about nothing except just basic reading like a book then it might be too featureful/complex

There's a lot of benefits but for me the biggest one is reduced lag

Well, I thought it was an os replacement. I never got around to learning about it, but the current kobo I have can’t be activated if it were to get reset.