The original truly captured the spirit of Superman while Man of Steel tried to make him more like Batman. Outside of the action sequences I was very disappointed in a lot of the creative liberties Snyder took with the Superman mythos.
Born in '79 and grew up on the Donner Superman films. However I don't think they have aged well. The comical/fun Superman that those films were based on from '60's & '70's comics hasn't been in the funny pages in a very long time.
Man of Steel finally brought the Superman that was familiar with seeing in the comics from the early '09's to today. It also finally brought Warner Bros./DC to their senses and spinning out a comprehensive Cinematic Universe.
Love the Donner/Reeve Superman but I went with Man of Steel.
Nostalgia says vote for Superman, but the action and effects in MoS were damn good. Plus I like the edgier Superman of MoS because he's not the classic boy scout.