I got the cummins QSB 380's. I wanted the 425's but they did'nt make production in time for my boat. I wanted the commonrail engines. I seatrialed one with the 440 yanmars but I was not impressed with them. Very noisy and they smoked a lot.
With both cummins ideling, the generator makes more noise. I only have 30 hrs on them and so far I really like them. I get a 27 kt cruise at 2700 rpm with about a 30 gal hr fuel burn. Time will tell