There is a decent jrpg/otaku fanbase on the Xbox 360 in North America (and the Xbox 360 has the hardcore shmup fanbase in Japan and they have a bigger visual novel/dating sim fanbase than the PS3. Though not as big as the PC, where the visual novel/dating sim genres are king). It's just bigger on the PS3 side. When I had bought the Xbox 360, the PS3 was lacking in that department whereas the Xbox 360 had a number of then-exclusive Japanese (especially jrpgs) games. Though now the situation has clearly changed with the PS3 getting a lot of exclusive niche Japanese games.
To be honest, I haven't really tried much of that exclusive niche Japanese library on the PS3. I'm not a Disgaea fan, 3D Dot Game Heroes is a good game but not really something that grabs my interest (I played through a few temples and sent it back. Never was a big Zelda fan but the game got so much hype here that I just had to rent it). And the glut of niche NIS games don't really intrigue me to be honest. Jrpgs are such a huge time sink. I don't feel like playing all of these games. It's much more convenient to play a shorter game (I've started Last Window on the DS recently and it's quite enjoyable) or watch TV/movies to get an entertainment fix (maybe I'll get more into anime as opposed to the jrpgs). Jrpgs sometimes start to feel like work. Though I did rent FF13 recently. I'll see how that goes.
