Posted By:
hankronIn only my opinion, PSA/DNA and GAI are reputable. As both are well known, it makes resale easier. Mike Gutierrez is one of the judgers for GAI. If you sent an autograph to Gutierrez you likely will receive a GAI LOA, and if you send a baseball signature to GAI it may very well be looked at by Gutierrez.
I've never paid to get an LOA for an autograph, as I couldn't afford it.