Honestly, I don't know.
The moaning in both languages sounds fake and kinda ridiculus.
In western porn they tend to sound like zombies and in japanese porn they sound like squeaky dog toys.
The sex talk in both is also stupid.
In English, it's often a "Give it to me baby! Fuck me harder! Oh yeah, your huge cock!" and in Japanese, often every little thing is described
(I once played a 3d porn game in which the woman talked constantly and narrated everything that was going on).
But since I don't understand Japanese
except for a few words and phrases, at least I won't notice if the voice acting is terrible.
