There's a massive difference imo. OA was created and is maintained solely for the enjoyment of those who provide the content, any entertainment visiting fans may get from it is purely incidental. With AFTV the people who provide the content are selected because they have been proven to draw in the most people, and the people who run AFTV select contributors purely on this basis. AFTV is now a money making scheme and even if it wasn't Robbies intention to entertain rival fans when he started out, he's aware that that's what he is doing and he is taking full advantage. Good for him you know, I don't hold it against him, why shouldn't he make money off what he has started from scratch on his own? But there is a degree of cynicism, whereas no-one who has run this site has ever made from it, rather invested money and not really got it back, because this place is a labour of love. Theirs is a money making venture, ours is not. People are selected to appear on AFTV with a degree of cynicism, on this site all fans get the same platform for their views.
I'm sure you weren't getting so deep with your comparison, but your post just made me start thinking about comparing the two, and aside from featuring the opinions of Arsenal fans I don't think OA and AFTV are at all alike.