I doubt Japan can afford Raptors at the US$258 billion price per unit. The F/A-18E/F would be a much better choice if they want a stealthy multirole fighter. The Typhoon is just as stealthy as the Super Hornet, but then it carries much less fuel internally, which means up to 3 hard points for external fuel tanks.
Nehh, the F/A-18E/F is the better choice.