Well you are entitled your opinion and most would probably agree with you but I see Borg over Federer clearly. If you want to know why, well did Federer dominate the two most polar opposite surfaces like Borg did? Remember when Borg played grass was real grass, and he dominated both clay and grass so long. Federer dominates slowed down grass and hard courts for quite a few years, not quite as impressive IMO. Also Borg achieved slightly more overall on hard courts than Federer on clay, and you are the one pointing out often how weak Federer's clay court competition is which cant be said of Borg's hard court competition with Connors, McEnroe, Tanner, Vilas, and Gerulatis all there. Borg has beaten the best players of his time on hard courts like Connors and McEnroe many times, just never all in a row to win the U.S Open, but Federer has hardly ever beaten Nadal on clay.