Whatever you can afford is always going to be the best answer, but since you don't list your budget at all (which is probably the most important part of it.), I'll just ask, what's important to you in a monitor?

Color accuracy? Refresh Rates? 2K/4K? Brightness? Size (giggity)? Type of panel?

I'm personally using two monitors. LG 34WN80C-B (34-inch Ultrawide), and LG 32QN600-B (32-inch). The ultrawide is my main monitor, quite color accurate and love the screen real estate, especially with Daz. The second monitor is a mix of folders, reference images, and often other lesser used panes that I just leave up there to have more space on the screen.

This is the monitor I just got a couple days ago -

https://www.amazon.com/dp/B088YN9LBK?psc=1&ref=ppx_yo2ov_dt_b_product_details

But in Windows setting in the display setup it list these as the top resolution settings -

3840x2160

2560x1600

2560x1440 (recommended)

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When I change the settings there is a big difference between the top setting and the recommended setting.