Both of them have their strenghts and weaknesses, they both had their bad moments and good ones, right now DC is in something of a bad spot because of how wildly succesful the Marvel Cinematic Universe is, as well as movies from other Marvel products being made (example: the Sony-produced The Amazing Spider Man movies) but the opposite, that Marvel was in a bad position while DC flourished, was true in the past and I am pretty sure that cycle will continue eventually.
Personally... I kinda prefer DC right now because I was exposed to more of their stuff as I grew up (both comics and cartoons) and also because I think Marvel tends to be a lithe too hard on their Heroes (Peter persecuted by the public, the X-men being hunted down by everyone, and of course... the entire Civil War fiasco.)
But that is just me, I don't hate either of them at all.