Well based on the image of the Felder cutter head I found vs Grizzly and Byrd it seems logical it would consume less power as there are fewer inserts in the cut at a given moment in time. This would explain to a degree the reduced noise as well. I don't know about smaller chips but the Felder seems to have a deep trough for chip evacuation. I always thought my Byrd heads produced small chips, I remember being impressed with the dust sized chips my cyclone was able to capture and keep out of the filter when I emptied it a while back.
I tried to find out what RPM the Felder cutter heads are spinning but they don't seem to list this, that's also part of the equation as is feed speed. Its entirely possible Felder has invented a superior cutter head I don't know. In metal working someone is always inventing better tooling that cuts faster lasts longer and hogs more material. Wood working is just getting its feet wet in this area by comparison, the tooling/cutter choices in metal working is vast.