As has been stated, there is more than one question in the poll. Also, "which company grades the most accurate" is a question that really can't be answered without knowing what the grading benchmark is. You see, the TPGs don't grade to a unified standard. It's true they all use the 70 point Sheldon grading scale...but that's it. PCGS uses PCGS's standards and NGC uses NGC's standards and so fourth. So, based on that...all the TPG's grade most accurately to their respective grading standard. None of them use the ANA standards. As for your second question, it's a little easier to answer. Typically, a PCGS slabbed coin will sell for a premium over an equivalently graded NGC coin. So, a PCGS MS65 is typically sold for more than a MS65 NGC. But, based on the grading standards of the company, the NGC coin might actually be nicer. So, IMHO...if you are going to buy, look at the coin and learn to grade it yourself and buy the best one you find based on the standards you use. If your going to sell, PCGS tends to carry the best premium for a specific grade...most of the time. As for the poll, I didn't answer. I don't think it can be accurately answered.