In Japan? Get a 360. MS is subsidizing them so heavily over there trying to gain some ground against Sony that you'll get the system for a song, and you'll likely have lots of "value priced" games to chose from, compared to the PS3.
I really like my 360. Haven't played the PS3, and won't most likely, so I can't give a really honest opinion. I HATE the "dual shock" controller. Worst design of all time, imo, which is why I haven't bothered with the PS3. The 360 controller is really nice, though, and the system itself, while loud is pretty good.
I've enjoyed GoW the most so far, and I've started Elder scrolls, but GoW interrupted it so I will be starting over at some point. However, the XBLA is fantastic. Geometry Wars is lots of fun, there's plenty of great retro arcade titles, but Settlers of Catan was probably the best $10 I spent in 2007. The online play for the XBox is pretty good, like everyone says Live is well made, but there's some things that I think could use some work... fortunately MS seems to be intent on updating Live pretty often, so it gets better with age.
The graphics, from what I can see of screenshots and online videos, of the PS3 and 360 seem to be about the same. The PS3 has some stuff in the works that might be pretty impressive, but I withhold judgment till it's actually released. Until then, GoW is easily the best looking game on any console right now, and it's an absolute BLAST to play.