I used to think that Roger Federer was the greatest tennis player of all-time, but now I think Nadal is.?

Nadal's lifetime record against Federer is 17-8, and in grand slam finals he's 6-2 vs. Federer including 4-0 vs. Federer at the French Open. Like Federer, Nadal has won grand slams on all of the surfaces, at all of the majors. He's a beast out there, and totally dominates Federer, who's supposed to be the greatest player of all-time. So, my question is. How can Federer be the greatest player of all-time, if he's not even better than his main rival, Rafael Nadal? To me, Nadal, is the greatest of all-time. Personally, I like Federer better, but Federer is the second greatest, Rafa is the greatest. Yes, Roger has 16 grand slam titles, and is 29 years old. However, Federer hasn't won any since AUS 2010, and it's unlikely Roger will win anymore, especially with the way Rafa and Novak Djokovic are playing. With Rafa being only 25, I can easily see him surping Federer's 16 in 3 or 4 years by the time Rafa is 28 or 29. What do you think?