Greetings . . .
I don't see why the harmonics would all that different between these engines. I drew this up over coffee this morning:
Both designs are based on three sets of throws in planes 120 degrees apart. The difference is just the order in rotation.
I don't see why one design would be better/stronger then the other. They're just different variations on the same basic design. I don't think there's even any difference in the effort to cast or machine the pieces.
regards,
stock49