I guess it would depend.

Honda doesn't make its own diesels... yet... it buys them from elsewhere. Toyota has some good D4Ds in Europe that it can't bring here because of fuel quality. Hyundai CRDis are nice and smooth, for the most part, if you take care of them...but apparently nobody is immune to poor diesel quality. I've seen BMWs smoke, I've seen Hyundais smoke, I've seen Toyotas (lots more though) smoke. Isuzu? Seems like no issues yet, but I've been hearing rumors of a recall regarding nozzle gaskets. But as this is eerily similar to the o-ring issue of the Trooper, it has a 50% chance of being hearsay based on Trooper horror stories and a 50% chance being true (as in Isuzu hasn't learned anything about gaskets in the intervening years...). Am still looking it up.

The most impressive diesel I've driven recently is the Focus TDCi... and that isn't even a Ford engine... it's derived from Peugeot. And BMW and Audi are famous for creating high-powered diesels (BMW's 2 liter diesel can be boosted to 200 bhp by simple chip tuning)... so I'd say... the Europeans win.