So I have been bta testing one UI 5.0 on my Z flip4. Honestly it's been pretty stable without any problems. But really there is not a difference between android 12 and android 13. But it's nice to see Samsung getting the update out so quickly.
They added a few new things like connected devices. So you can quickly see everything that's connected. Also new privacy and security so it scans your phones for any privacy or security issues which is Handy to have.