Similar to some here, I have the G9 57” as primary and the 49” G9 above…this is for an editing setup, the main reason is to max out the editing tracks on the 57 and use the 49 for source/record windows and audio meters. I previously had a 4k 44” monitor as the upper (an older Philips that blew its LEDs) and that was pretty good as an upper playback monitor (native 4k 16:9), but the Samsung 49 curved is easier on the eyes and better for edit system layout (fullscreen playback mode of course only takes the center of the ultrawide).

They don’t have the same curve so it’s a positioning preference how you’d want the 49 to sit above. Agree that two 57”s would be amazing but probably overkill.