I dont see anyone saying this but it depends on the size of the monitor too, if he likes 24 inch then 1080p should suffice, 27 inch would preferably be 1440p and 4k for anything larger than that. I find that 1080p 144hz-240hz would be best for budget. But if you have money to spare, do get the 1440p 144hz as it seems to be the sweet spot for price and performance.
I dont see anyone saying this but it depends on the size of the monitor too, if he likes 24 inch then 1080p should suffice, 27 inch would preferably be 1440p and 4k for anything larger than that. I find that 1080p 144hz-240hz would be best for budget. But if you have money to spare, do get the 1440p 144hz as it seems to be the sweet spot for price and performance.