Good and creative artstyles and aesthetics usually impress me much more than just graphical prowess, and I love fantasy so this is an easy win for Japan for me. I can't get excited about bald ugly soldier dudes or military shooters, as impressive as they may be from a technological perspective.
My favourite is X because it's an actual game and will probably be amazing. The most impressive is Agni's Philosophy, it is both technologically and artistically outstanding.
Zelda and especially Deep Down are impressive as well, but they are both just a few models in a closed environment, and Deep Down is too generic and brown. I also think Deep Down will likely turn out like those Motorstorm and Killzone tech demos for the PS3 (which might very well be the case with Agni as well).