The "which monitor is best for design" is an age old debate you will NOT solve here, or quickly. I can promise you that looking at great and expensive gaming monitors is not the best way to find your prize.
Monitors are all about target usage. Gamers don't care about color accuracy, but instead focus on refresh rate, black levels, gray-to-grays, max resolution, and more. None of which matters to us.
I could literally debate this for days. So instead, first I would suggest posting your maximum budget. Second, you should determine if you need a monitor NOW or if you can use a generic while you shop. And third, you need to decide on what your real usage needs require.
If you're buying for a team of designers and you need speakers as well as accurate color, that will narrow it down.
If your budget is $400 or $1500 that will narrow it as well.
If you want as much Adobe RGB spectrum as possible for the price but are willing to wait a few weeks to used-shop, that will narrow it down.
I can tell you that really good NEW Adobe RGB spec monitors run $800-1200 each and come with 0 features, poor size choices, and none of the "fancy" specs found on normal monitors. If you have kept an eye on model numbers for a while then you can find your desired model for $400-600 used, but you have to know exactly what you're looking for.
Do so much homework, and then come back confused, and then I can probably help you more lol.
If you want a super great choice on a new middle-ground price, color, and size, I would suggest the Samsung CH series. Designed for gamers, but it produces 125% of the sRGB spectrum and 92% Adobe RGB. Downside is the 1080 resolution and such, but again, we could play this game all day. Is this the best option for designers or Adobe color accuracy? Absolutely not. But I find it's a way better generic recommendation (for this quarter) than these expensive gaming monitors people buy when I do prepress consults for shops.
If you were looking at a great gaming monitors trying to get color accuracy, then you do better just buying any large screen junk you can find. That extra money is going nowhere.
Oh and anyone that thinks those Mac 5k or previous monitors are the best. No. They can get decent once tuned, but 1 no one calibrates them and 2 they are far too bright and oversaturated to ever produce D50 claibrated images. And for what you get compared to the competiton, not even close to a good value.
