There is a difference between durability (the Japanese are good at this) and innovativeness (U.S./EU are good at this) of transmissions. EU/US transmissions are mostly all 8+ gears (now 10) in torque converter type (conventional), EU lead in DCT (dual clutch transmission), Japanese are only just catching up to this.
Japanese are of course, market leaders in CVT (continuously variable trans), but these are not that well liked in EU/US markets because of the way they "feel," though getting better.