look I've seen some Euro, american, easetern Eros and Sth American porn. But Jav has something more. It has (in my opinion) better looking actresses, more fetishes and no one can do cute porn like JAV. So JAV wins hands down.
I think that the best thing about JAVs other than the girls is that the actors dont talk a lot. I really hate the "dirty talk" in porn from some other places. Also the JAV girls moans are cuter but of coarse not as cute as hentai.
I've heard it from both males & females that the squeeky screaming is annoying. Personally it really turns me on.
desioner