For me it all comes down to display size and density, and therefore out of all the monitors I've tried, I'd go 27" at either 5k or 2.5k resolution. For me 27"

For me it all comes down to display size and density, and therefore out of all the monitors I've tried, I'd go 27" at either 5k or 2.5k resolution. For me 27" is the perfect display size: - Any bigger and I find I have to move my head to much to be comfortable in the long term and I get a stiff neck. - Any smaller and I can't fit enough on the screen at once and my productive decreases. 2.5k (1440x2560) on a 27" monitor has pixels at a good size that most apps scale by default beautifully on. 5k is exactly double the density of the already perfect 2.5k, so (at least of MacOS) everything displays exactly as it does with 2.5k except really crisp! Therefore, I now run the 27" LG 5k as my primary screen, and my old 27" 2.5k vertically on the side for all those status like things that it's good to see but don't require my focus. Also, since the size and "looks like" resolution is the same, I can drag windows between them without any changes and size/scale. It just works!