The following are most reputable grading companies in the coin industry. You have to keep in mind that each coin company grade's each coin differently; as a result, the same coin will be graded higher or lower depending on which grading company you choose. The most conservative grading is PCGS. Rumor has it that PCGS coins will go in the market for 10% more than NGC and even more so for ANAC. My personal experience is definitely 10% higher than NGC. This subject will be discussed more in depth in Grading Info section. My personal pick would be NGC because they do make the best holders in the coin industry but I would get my coins graded by PCGS because of demographic advantage. As far as ranking, PCGS will take the first place because of the simple fact that they sell for higher price on Ebay. Keep in Mind NGC still holds the record for best holders.
Following are the top 5 grading companies:
1. PCGS Rating *****
2. NGC Rating *****