MacBook Pro - issues connecting to external monitor(both DisplayPort and HDMI)

I have an Apple Macbook Pro 16 Inch (Touchbar) 2019 w/ AMD Radeon Pro 5300M. I'm running into issues connecting it to this monitor, [PX329](https://pixiogaming.com/products/px329) . If I use DisplayPort(this monitor supports up to version 1.2) then my mouse starts to lag/skip which is really annoying. If I use an HDMI cord, with [this](https://www.amazon.com/dp/B07THJGZ9Z) adapter, my external screen goes black about every 20-30 minutes for a second or two and then back to normal. I'm using 2560x1440 resolution on my external monitor w/ 50 Hertz refresh rate(I tried 60, same thing). At this point I'm not sure what I should buy. I'm considering either: 1. Get this [DisplayPort cable](https://www.amazon.com/DisplayPort-uni-Thunderbolt-Compatible-More-Gray/dp/B075V27G2R) or 2. Get an HDMI to USB-C cord without an adapter. Could you please recommend what's better, I'm not really sure what specs I should check on the monitor to figure out which route to go. Thanks so much.