I personally feel it's a mixture of both. I mean I have heard nothing but good things about the latest JLA story lines, but the same can be said for New Avengers with it's cool new line up.
I am now buying more Batman stuff than I ever bought before in trade paperback, I love the new stuff with Batman's twisted relationship with his former ward, Jason Todd and the fact that Jason is a match for Bruce or Nightwing.
However saying that, I have also been collecting the latest series of Captain America, the art is reasonably good and the story lines are excellent. I haven't read every issue of the series but I have read most of them and intend to red them all and so far I haven't read a bad issue of that series
So whilst I'm generally more a fan of Marvel (Spidey, Deadpool and the latest crossover, Civil War, has IMO been great.) I'm starting to get into DC just as much. I'm really enjoying anything Green Arrow related and his recent fight with the Red Hood was cool
P.S everyone check out the GA respect thread, It's cool