Charging System

Actually, the mop ones may NOT perform the same. The older "roundback" is known far and wide for it's poor low RPM output, and even the squarebacks, there is one or two lower output models that actually outputs BETTER at lower RPM than the higher amp unit.

This is one reason that many guys have gone to stuff like the more modern Densos

I don't know "who all" is always better. The only way to tell for certain would be to obtain the engineering data, which relates output vs shaft RPM, or else experimentally set both up for a "real time" test.