I have used one wire alternators before, and I don't like them. They don't start charging unless you rev it up. A regular three wire alternator starts charging instantly. Some of the problems I experienced was with an automatic choke. When I stepped on the gas to rev it up and get the alternator to start charging, then the automatic choke releases the high idle. That foils any attempt to let the car warm up on high idle. And if you got a little bit more duration in the cam, it doesn't want to idle until it warms up, so that high idle is needed.
In my circumstances anyway, I don't see any big deal about two extra little wires going to the alternator.