The watermark has to be partially over the most important part of the photo, if it's for security.
However, in this day of AI that's pretty pointless, I'm afraid.
Broadly speaking, the Asus ProArt is the higher-regarded of those two monitors.
In my personal experience, I've always been very impressed with Acer monitors. For the budget, that one look good.
Yeah, I figured the problem had to be coming from outside Photoshop. No doubt the syncing is causing the problem. Can you set it to only sync at a time when you're not actively working?