I have no signal errors with my system. just move the pick ups closer to the vanes in the distributor until they are nearly touching. I can now run the sensitivity on "low" rather than "very low" at cranking speed. Error count = 0.
God only knows how a factory computer can pick up a good signal with such a high factory trigger clearance.
As for optic sensors, RB-30's have a good system from what I have heard.
At the end of the day the management systems are all similar, A good tune is the main thing.