As someone who's been a Stock Android fanboy and got his first Samsung in over a decade, the only significant change for me is:

Keep pop-up windows open – Instead of minimizing pop-up windows when you go to the Recents screen, pop-ups will now remain open after you leave the Recents screen so you can continue what you were working on.

Pulling down from top right corner to show the full quick actions menu. Now I need to swipe down twice to see all options, with this update only once. I will actually install the beta solely for this feature.

There's always the under-the-hood changes from Android upstream, and Samsung keeps adding customization options every update. Without rooting or 3rd party apps*, no other OEM comes close to OneUI's customizability. For me, that's a huge plus.

*I meant specifically 3rd party apps, because Samsung has the Good Lock suite of apps, which needs to be installed from the store. They work somewhat as a beta testing of features or advanced controls for existing features, and many of the features are added to new updates, for instance, the quick settings easy access up to One UI 5.1 (Android 13) is only available via Good Lock's Quick Star module, but seems to be built-in on One UI 6 (Android 14)

I think this solely refers to the "containers on a blurred background" style. They both do look somewhat similar (but not really identical).

Android 14 isn't out yet, those are beta screenshots. One UI 6 stable probably comes out in December.

1. You need S23 series phone AND need to be in one of the specific regions. More phones will be added later.
2. Use Samsung Members app to opt in to beta
3. Do a software update like how you normally would. https://developer.samsung.com/one-ui-beta

You also need to check that your phone will get more updates and it hasn't reached its update quota. In that case getting the newer updates became trickier.

No way bro got emoji as username 💀. Didn't even know that was allowed.