For Christmas, a friend of mine gave me an official World Series baseball from the 1992 Toronto Blue Jays.  It contains 26 signatures including HOF - Roberto Alomar, manager Cito Gaston, and Joe Carter.  Ball is in great condition, in a case, with the signatures written in ball point pen ink.

I am 100% sure of it's legitimacy and authenticity.  There will be zero chances or rejection in terms of the signatures on the ball as my friend was given the ball via someone who worked for the Jays at that time.  That is not the question whatsoever.

I wish though, to have it authenticated just so that it is officially official.  I wanna make this my own prized piece.  With whom should I go with.  PSA/DNA  or JSA  or someone else?

I have never used these type of services before. 

Thanks.