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If you need to choose between a 4k monitor or a monitor with high hertz like 144hz or 240hz for play ashes of creation what do you buy? Are hertz important for MMORPGs? or is it preferable have a better resolution?
IMO it really depends on what your machine can handle. I have an 2k 100hz ultrawide I use almost exclusively for MMOs. I used to use a 60hz 4k HDR one before that and I have a 144hz 2k 1ms for fps games.
Unless you play a lot of FPS games, refresh rate doesn't matter that much. I'd focus more on resolution, brightness and display size :)
I can't recommend ultrawide enough though. Once I made the switch, it was a total gamechanger for MMOs. I'd shoot for 120hz+ if you can, and 2k is fine but 4k would be very nice :) budget is obviously a big variable lol.
Good luck on your search!