Hey there
So I'm currently using beta for S24 Ultra and can report that there are some improvements in camera, especially with point and shoot and zoom. Bit overall I've been underwhelmed with the camera experience on S24 Ultra.
If you believe gossip on the web, then the Ultra Wide camera will get an upgrade but not much else overall in the S25 Ultra but we will have to wait to the Unpacked on 22nd to find out what the S25 series will really look like.
As for trade in, Google the recyclers and you will see over £600 offered for S24 Ultra but your scratched screen may be an issue. Hence we recommend screen protectors.
I am not employed by Samsung nor do I receive any remuneration as a Samsung Members Star.
My device is an S25 Ultra.