DC because I love powerlevels. It's the power that defines quality. Marvel doesn't respect POWER. Their POWER is all over the place. I'm so upset to see my favorite Marvel characters get shitstomped by DC, but it is what it is. The strongest heralds in Marvel would at best be mid-heralds in DC. My only hope is that Odin doesn't lose to somebody truly despicable and weak like Flash and Thor gets to beat Spiderman, but the way things are going, that is a wild shot, so I have to go with DC, every time. DC NEVER has their streets like Batman, Deathstroke disrespect its POWERFUL people. Never. Hopefully my personal power and status tiers become a reality soon, because I'll have a nervous breakdown if they keep going like this and I'll start to HATE Marvel for the disrespect to POWER. And I like my story with a good deal of power.
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In all seriousness, if we take eliminate the last 10 years, in which both companies have been more or less shit [moreso Marvel], I'd go with Marvel. Consistently well written characters/stories [Wolverine, Spiderman [well...except one blip], Cap, X-Men etc.], consistent planning in storylines etc. DC may have higher highs that I personally enjoy [Batman RIP, Final Crisis etc.], but their 'average' is simply not that good. There's only so much Batman's popularity and relative consistency can carry the company -- Johns' GL [whether you liked it or not] was one of the sole long-running bright spots. And there's a blip here and there, but not frequent or long-running enough to really put them above.