Un-processed poultry (like breasts or something, not nuggets) was the big one I was thinking of. European stuff is higher quality in that there's less chemicals involved and it's cleaner but those are mostly public health issues (no salmonella outbreaks), not nutritional issues. If Europeans aren't actually eating in serious volume the classes of products where the differences are then it doesn't matter much if at all. And then there's all the products where it's a distinction without a difference, like eggs.