Personally, I prefer DC because I enjoy the overall feel of the characters.
I admit, before I was like many people who had never picked up a comic before - I liked Marvel better because I felt their characters to be more real and I hated Superman. When I finally found a comic shop that didn't take over an hour to get to, I only got the Ultimate Marvel books.
Then I picked up Infinite Crisis #1 and met Geoff and Phil. Now I love DC. Every week I go into my local shop and the majority of my pulls are DC. Each week I end up adding a title or two to my list. I love the characters that DC has forged. I'm far more interested in them than I am Spider-Man and Wolverine (Currently.). I don't care for relatability or "realism". It's a comic - I don't want to see my life on page, nor do I want there to be any "reaslism. I just want great characters that work together, with interesting stories.
(If anyone wants to recommend any titles, I'd appreciate it.)