I switched from a 40" 3840x2160 display to a 38" 3840x1600. I find the latter more comfortable for three reasons, one of which is that I don't have to move my head up and down too much.
(The other reasons are specific to those screens: the 40" wasn't curved, and had a slightly inferior screen.)
I love the 38” 1600p format so much, it’s both wide and tall while still feeling like it’s a single monitor. I’ve heard though from friends in the industry that it’s not long for this world :(
I recently spent a few days working in front of two 27" QHD monitors. It made me realise how often I have three windows side by side (working doc in the middle, reference materials to the side).
(The other reasons are specific to those screens: the 40" wasn't curved, and had a slightly inferior screen.)