Buy the cheapest digital cable that works reliably and don't spend a dime more.
You and grandparent are saying the exact same thing. The point that GP was making is that some of the cheapest of the cheap cables don't even meet the relevant specifications and that that can cause problems.
You don't need cables made out of gold, but you often do need them to conform to the specs. I've had this problem with cheap as shit HDMI cables where my components wouldn't recognize each other until I replaced the cables with monoprice cables. So it's not like I had to spend a ton, but I did have to get actual certified cables.