Well Having been taught by both, I would have to say its a toss up.
Friedlander, or ERF, as I know him as better is way smart when it comes to pathology. He is quite "unique" to say the least when it comes to his personality but he does know his pathology. He can look at a histo slide and diagnose so easily and he can look at general gross path and dx as easily. He is rather abstract when it comes to teaching path but some people dig this about him. I think if you spent a year or two working with him on a daily basis you would really increase you field of pathology greatly.
Goljan on the other hand is a straight arrow "professor" type. He is kind of funny at times as well. He also knows his pathology and a bonus for him is that he can teach at a level that can benefit the "not so" talented in path or pathophysiology and he can teach at the level that fits the "stellar" students in pathology and pathophysiology. He is also a fatherly figure. He was exceptional in his board review course and I found it to be wonderful for Step 1.
So all in all, I would call it a toss up. It all depends on how you like to learn and what field of medicine you are going into. If you are deadset on a being a pathologist, I think ERF might be the best for overall and even wacky pathology knowledge. If you are deadset on any other field and need a basic and thorough general Path and Pathophysiology, then I think Goljan would be a good choice. So when you add all of it up, its a Toss Up!!!