Michael Phelps Or Usain Bolt ,who is the real hero of 29th olympics?

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Michael Phelps ,23,got 8 gold medals for USA,only Soviet gymnast larissa Latynina holds more total career Olympic medals with 18(nine gold),comparedto Phelps's 16(14 gold)! Usain Bolt0,22,a Jamaican sprinter and holds the Olympic and world records for the 100 metres at 9.69 seconds,the 200 metres at 19.30 seconds and, along with his teammates ,teh 4*100 metres relay at 37.10seconds.At the 19th Olympics he became the first man to win all three events at a single Olympics since Carl Lewis in 1984 and the first man in history to set world records in all three at a single Olympics.His name and achievemnet in sprinting have earned him the media nickname "lighting Bolt" who is a hero ?