I had to think on it for a while, but I eventually decided that Marvel still holds the best amount of entertainment for me.
I think it applies to a lot of today's modern "superhero" audience when I say that many viewers aren't "comic book fans" in the traditional sense, myself included. I never had a DC comic book subscription when I was younger, and I never actually read any DC media until an issue of Batman Beyond was given to me at a later age. What I did have growing up, however, were Spiderman and X-men comics, both of which are consequentially my favorite Marvel universe franchises. I remember being overjoyed to read both of those when they came in the mail (The two of those on top of various Archie series along with Nintendo Power were the longest subscriptions I ever had), and probably a huge reason why I love the Sam Raimi Spiderman movies along with a good many of the X-men films. But as far as actual comics are concerned, that's all I ever had. So it's kind of hard to judge DC when the inherent bias is there.
So I actually just look at what's most in the public eye today, which of course is the various pieces of film out of each company that we get on a yearly basis. As I said before, I thought the Sam Raimi Spiderman movies were awesome when I was a kid, but recently (just finished last week, actually) I re-watched them to see if they were truly great movies, or if I just remembered them being good. I was really happy to find out that I still greatly enjoyed all three movies, and that they stand on their own without my bias in favor of the Spiderman character itself. But what really threw me for a loop was just how good Spiderman 2, and to a lesser extent Spiderman 3, are in their own right. They're just so good from a character-development point of view, especially Harry Osborn through all three films and Dr. Octopus in the second one. It's for this reason on top of others that I consider the Raimi films vastly, vastly superior to the garbage Spidey reboot films we've gotten recently. But I digress, it's not of much consequence when pitted against Marvel; point being, I think there's a strong case to make that Marvel movies, especially Spiderman 2, can more than hold their own against the heavy-hitters that DC has delivered with the likes of Batman and his multiple cinematic ventures.
It's also worth noting that while X-men had FAR more ups and downs than Spiderman did, it still had some excellent movies as well, my favorites being First Class and Days of Future Past. But apart from Spiderman and X-men, I'm honestly not a fan of the rest of Marvel's heroes. They're not BAD by any means, but the only one I'm entertained by is Iron Man, almost exclusively due to the remarkable acting ability of Robert Downey Jr.. But I guess what I'm trying to get at is that, in the event that I make judgement based solely on media I've experienced, and that I think a number of Batman movies are better than anything Marvel that isn't Raimi Spiderman and X-men, it becomes a matter of Batman vs Spiderman/X-men, as I think the Superman movies, especially Man of Steel, were far away from a quality standpoint from the likes of Spiderman 2, Days of Future Past, and The Dark Knight.
So that brings up the Batman movies themselves, which I also think are excellent. Burton's Batman and Batman Returns are far better to me than many of Marvel's modern movies ranging from Thor to Captain America, and I think those two alone would warrant a great deal of thought when I finally make a decision (Batman Forever and Batman and Robin never appealed to me, and having re-watched them along with the Raimi Spiderman trilogy recently, I can confirm that I don't think I'll ever like them). But then you have the Nolan trilogy, which I think is probably the greatest superhero film trilogy of all time. This is especially true with The Dark Knight, which I'm sure many would agree is the single best superhero movie of all time in a lot of ways. I just love this trilogy so much, it contents very tightly with my childhood love of Spiderman and X-men despite my nostalgia for the latter.
I do eventually conclude that Marvel as a whole has offered better entertainment for me, although I can hardly say that my personal opinion is completely educated as to what DC offers in its various forms of media. But as it is, I do like Marvel a bit more.