I have the ultrafine 5k. 27 glorious inches @ 218ppi. Not only does this provide a colossal amount of real estate for crisp text (I run with no scaling, which requires good eyesight), but combined with a macbook pro, provides a near perfect computing solution. One cable provides video, audio, usb hub, webcam and power. Two monitors might be better, but I find leaving the laptop screen open on a stand works well. One quarter of the ultrafine provides 2560x1440 resolution, so side by side, or corner layouts work very well.
https://www.lg.com/us/monitors/lg-27MD5KA-B-5k-uhd-led-monit...