I have used all and I prefer Android for the freedom it grants. If the keyboard really is your biggest worry then just download and install a new keyboard and/or language pack. Not to mention you can always find spurs on the market to expand the Japanese support, like simeji.
https://market.android.com/details?id=com.adamrocker.android.input.simeji&hl=en
iPhone = Great gaming device. Don't agree? Who cares, because you're wrong.
Currently playing:
Final Fantasy VI (iOS), Final Fantasy: Record Keeper (iOS) & Dragon Quest V (iOS)

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