Cummins vs Perkins
I don't know about the Cummins marine engine, but their 4bt & 6bt truck engines are outstanding. I don't believe Cummins' factory does the marinization of their engines, so there would be concern with the reputation of the 3rd party shop. Would the Cummins be better than the Perkins? I believe they would be at least as good if not better. Parts for the Cummins should be more readily available, that's for sure!