Honestly, I don't care. Why do a vs. thing? It's like Rock vs Electro. I think it's stupid, no offense hey?
There are multiple reasons to this; first, as someone already said in this thread, because of the cultural mixing, you can't really tell influences, even if different cultures will play the same genre differently because of said mixing.
I can say that for instance I love japanese punk rock. They have a tendancy to either go for more raw power (Guitar Wolf amongst others) or really groovy basslines and melodies (B-DASH and Mongol800, amongst others).
They seem to have a gift in sugary happy hardcore, too, and in low-tech music. Well that one is quite normal, given Japan is the land of the NES after all...