The circle search is nice, I don't use it much, but nice to have. That is coming to the S23U, so if you're patient you'll get it.
To be real.. If you really want the flat screen that would the biggest difference you will notice. The anti glare screen is nice also, so that's 2 nice things you will notice.
If I could have used it for a couple weeks without having to deal with returning to Samsung I would probably have kept the S23U. I'm not saying the 24 is bad, it's just the normal minimal yearly upgrade. It works good just like the 23. Most of us on here have to get the newest shiny toys all the time, we are sick people with an addiction we need help with.