Cheap cables might not be made with all copper conductors or might have other issues. I've seen people post pictures of super cheap cables whose connectors burned up. I would only buy a cable from a reputable brand, vs saving the extra few bucks. Any big hardware manufacturer, Anker, Aukey, Monoprice are all interchangeable.

I think that if you want a cable for more than 65W you need to buy one specifically certified for that. I plug my laptop in with a 4' Anker braided cable with an Anker 65W GaN power supply and it works fine.