How bright is the environment you'll be using it in & what is the cost difference in your region?
Personally, I'd be leaning towards the Acer. But if you operate in a really bright environment the AOC may be better for your needs.
HDR10 isn't that big a deal at the brightness the ACER is capable of, but is a nice to have, ditto HDMI 2.0, chances are you'll be using display port anyway.
If you're looking second hand :Nvidia: 2060 or betterAMD : 6600xt or better.
I wouldn't bother with older generations at this point, I'd also be a touch hesitant to go with much newer, unless you're willing to bring the GPU forward to your next build.