Usain Bolt vs Michael Phelps: Who is The Greatest Olympian Ever?

Usain Bolt and Michael Phelps took part in their last Olympics in Rio 2016. While Jamaican Bolt sprinted to a record 'triple-triple' (winning the 100m, 200m and 4 x 100m in three straight Olympic Games), American Phelps swam to his record 25th gold medal in Rio. Both Bolt and Phelps are supermen and probably their feats will never be repeated. An elite NDTV panel gives its vote on who is the greatest.