I am sure U are talking about handheld war, O.K I will go By your thoughts
3DS is supported by Nintendo & 3rd Parties (More than 100M lifetime for sure), Titles already announced suites everyone (There is something for everyone here) , Less price & everything is going Nintendo's way so it will win, (How did U know it will be less price did Sony announce it's price for 3 Regions?).
Till now I didn't see Japan market titles for Sony , I heard about western titles like Uncharted, Call of duty,.....ETC, Those are big titles to begin with don't U think.
Sony always sells it's products not only to gamers (Movies, Pictures, Music,....ETC) there is a market there also that made PSP be a big hit even though DS won the race but PSP didn't lose because it profited in the long run.
I believe 3DS will sell more, But PSP 2 will also sell & it won't surprise me if both systems top 100M unites this time around.