I think it's hard to pin point whose truly better at an RPG because has become so notoriously subjective, I'd be lying if I didn't say I prefer a Western developed RPG over a Japanese one simply because it appeals more to my personal tastes of what counts as good storytelling, character progression, and gameplay. That said, I think there are genres clearly in favor of Western and Eastern devs. Hack and Slash is obviously dominated by Eastern devs with the only truly notable pure Hack and Slash experience from the West being God of War. Simulation games are truly a Western hallmark though. Not to say Japanese haven't made any note worthy games in the genre, but Westerners truly love a good simulation game overall. Before I would have said that Japanese devs had the horror genre all tired as well, but Westerners have really breathed new life into the genre in my opinion with stuff like Amnesia or Five Night's At Freddys which show what is possible in the genre.
There are more examples I could throw out, but it comes down to preference. I feel like Western devs often deliver the most in the immersion of a game and for my money, that's where the real focus has been for a good long time no w in my opinion.
