AverMedia makes decent ones. I think Magewell makes "professional" ones that give you the best image quality (4:4:4), but I haven't personally used them so can't attest to their quality.

Then there are all kinds of USB cards from dubiously named manufacturers, most being some white label chip that everyone uses. Some can work decently, some have a terrible capture rate like you mentioned. Due to the nature of these sellers popping up and disappearing, I can't really make a recommendation.