PSA/DNA and JSA/DNA Authenication
 

I know soo many people consider these two autograph authenication companies to be the best in the hobby for autographs but I want to others input on what makes these companies the best? I always put trust in them, just in case I was ever going to buy autos of retired or deceased players or Elvis Presley, and that time is now, so tell me your collecting input on them?