To be honest any person who considers themselves a Nintendo. Doesn't hate Sony, and Microsoft because of their games. If you don't know then I'm sorry I'm not going to explain that here.
I would say PS3 since you still get familar Japan content, and new western games. The 360 can provide you with western games, but nothing from the EAST. What keeps the 360 in arguement is the different library it has compared to the Wii.Which together would give you a complete video game experience. Something the PS3 almost provides on it's own. One more then the 360 has a more Nintendo type controller. AKA Wavebird 2 one of the best controllers of all time.
So it really depends on what you really want from the system.I love japanese games so I'd pick the PS3. If the 360 had more japanese games it would win.
