New to OLED , Ultrawide or 4K ?

Hey guys,

I've never had an OLED screen in my gaming life and i would like to try it.

I currently have a 38GN950-B 3840x1600. PC Specs : RTX 4090 - 7800X3D

I really like Ultrawide for the immersion , and i would like to keep it that way (if possible)

I value Visuals more than FPS, so it seems i should go 4K but there is no choice atm.

On ultrawide i could go with the LG Ultragear 39GS95QE 39" or the 45GS95QE 45"

Coming from a 3840x1600 IPS resolution , will 3440x1440 res be to much of a downgrade ?

It's for Gaming only, and as i was looking on many posts , some thinks the PPI isn't a problem and some says it's really bad.

Anyone sharing the same experience coming from that screen ?

Any other suggestions ? Was thinking to switch to OLED before KCD2 comes out.

Thanks !

( sorry if my english isn't perfect , second language)