The US has a lot more competent shooters than Europe does, but has many more gun owners in general. I wouldn’t bet on the average American gun owner being more technically proficient than the average European gun owner. The former is more likely to be completely untrained and largely uninterested, whereas the latter has had to jump through more hoops with a specific use in mind, and is more likely to be a careful enthusiast.
They are separate issues, but this reminds me that Americans have more of a car culture, but man oh man do we suck at driving compared to Europeans. It’s not even close.