Question Acer K242HYLH

If properly designed, both should provide identical, 100% accurate image transmission/quality. The quality of the cable that either uses, could determine the max length of cable that will work, but if you aren't getting cutouts then it seems both are good enough for the length they are.

The advantage would go to whichever one is cheaper but since you already have them both, I'd use the "cable Displaport to HDMI" because that leaves you the two separate pieces of cable and adapter box, more versatile to use for other things, like for example if you ever needed just the HDMI cable for something else, unless they are different lengths, then I might use the shorter one for now, leaving the longer in case you never need a longer cable for something else.