best type alternator?

What looks like yesterdays mechanical regulator on the outside usually has todays solid state components inside. They didn't regulate the same and probably still not regulating the same. The later model regulator that goes with isolated field ( 2 field wires ) will make the system a little hotter so other parts like solid state ignition don't suffer from low voltage. I haven't run comparison tests so I cant say for sure but... A replacement part is normally just that, equal in every aspect to its predecessor, no matter what it's made of. If this hold true with regulators, the little black box regulator, even solid state construction, wouldn't be correct/optimal for electronic ignition.