DC Comics (Diamond Comics) were always my favorites when I was growing up but I still liked several of the Marvel titles too.
With DC, it was Superman, Green Lantern, and The Flash as my first choices, then Batman (of the 1960s and 1970s - I am not fond of the modern Batman) the Justice League of America, Wonder Woman, and Captain Marvel (who once belonged to Marvel Comics – believe it or not).
With Marvel Comics I liked The Fantastic Four, Spider-Man, The Hulk, The X-Men, Thor, Iron Man, and The Avengers.
With a kid's limited budget (usually achieved through picking up bottles and cans alongside the road on my way to the store), I would always go for the DC titles first, but if there was extra money left over I would get whatever Marvel titles I could, too.
It's cool that they are finally making more superheroes movies. I would like to see more Superman movies and to finally see Green Lantern and The Flash on the silver screen... as long as they are based on the 1970's version of these characters. Sure, update the stories but PLEASE keep the ETHICS and characterizations of the heroes I grew up with.