I'be been using nothing but Dell UltraSharps with all our Macs for -- let me think -- probably close to 20 years. I like them a lot more than Apple displays, because we have the ability to adjust them separately from the OS, and we can shut them off if we feel like it.
I'm not generally a fan of 4K GUI displays because I feel like it's just too small to read the controls or file names easily. I think 2550x1440 on a 27" display is about optimum for Resolve. I run Resolve 16 in 1920x1200 on a laptop on occasion, and it's adequate for that but I miss the bigger displays. I haven't checked to see how well OSX scales with a 4K display and whether that would be an option or whether Resolve would look OK in a higher resolution.