They both have good reputations. A lot of good items and few bad items in my opinion. That's not to say they're perfect - more important than anything - you have to be comfortable with a piece. Don't purchase something on the strength of the seller alone. That's what I believe, at least.
I too have to agree that Golden State Autographs is a good trusted dealer. Caleb is very friendly and their is a lifetime guarantee and returning isnt a problem if doubts arise. And some very good prices too.