i to have noticed the value diff in the grading....

i my self am going to do a lil investment research. im going to send 10 of my 20 1981 p sba dollars to ngc and 10 to pcgs. this way when i sell them i will have all required notes on what the diff is in sales.being that i sell lots on ebay i do daily research trying to find what compitition is selling for and what it is they r selling.

i like ngc's turn arround time.but grey sheet lists pcgs as top grading company.and ngc in second.....

i also noticed that the pcgs prices are far more inflated than ngc=numis guide. my question is if pcgs back in the day had problems with "grading correctly " or pricing wrong due to there personal reasons, why they are still top on list?(some1 posted an artical on this subject a while back)