Roundback vs. Squareback alternators?

Joey4speed said

While square back is original for later years and has 2 field wires, for use with electronic ignition

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round back = electro mechanical VOLTAGE REGULATOR.

Square Back = electronic VOLTAGE REGULATOR.

some say that the Square back has better low RPM output.

Most round back are 1 field wire. For a year or so (70, 71?) There were 2 field (isolated field) round back alts.

Square backs are 2 field wire (isolated field) but can be wired (internally or externally) as a single field wire.