As far as I can recall, I’ve always known Marvel and DC were separate companies, and that while Superman and Batman would (frequently) team up, they probably wouldn’t have Peter Parker on the JLA speed dial. Then again, they could live in the same universe as him, and still not know who he was; that’s a critical part of the character’s concept to me, and probably why, amongst other reasons, I don’t get any Spider-man titles anymore now he’s a world-famous, out-of-the-secret-identity-closet Avenger.
That said, I’m certain I was a teenager before I started to recognise the individual tones the two companies had. I’ll concede that the two lines are now and have always been fairly different, but it’s only in the Sixties material that I’ve ever detected significantly distinct philosophies between the two. I’d argue that the relatively free movement of creators means that certain idiosynchratic styles will be apparent whatever company the work’s being done for. Grant Morrison will always write like Grant Morrison, for example, and for the past fifteen years or so you can track my ‘preferred’ company by whoever was publishing his major work at the time; DC during JLA, Marvel for New X-Men, then back for Seven Soldiers, 52 and All-Star Superman.
Even that admission feels strange to me. How can I really prefer one corporate entity to another, in particular companies that draw from the same, relatively small creative pool? I may have gone right off the Spider-books and the rest of the Civil War palaver, but I’ll still get Daredevil until the day I die and I still get plenty of other Marvel titles. And as much DC stuff as I get at the moment, no power on Earths One through Fifty-Two will get me to buy Countdown right now.
Having said that, I don’t advocate thinking in absolutes. It’s too easy to do, and God knows I’ve done it myself on far too many occasions. Until my discovery of comic blogs and message boards in the fairly recent past, I hadn’t realised there were so many people who almost exclusively liked either Marvel or DC over the other, and believe me I must have been particularly oblivious to not notice that. In the declining popularity of the underwear-pervert comic industry, this tendancy is unimaginably destructive, but unsurprising considering the lack of foresight, insight or empathy for anything that elements (hopefully, the minority) of the super-hero comics community regularly display on an almost daily basis. In the kind of world we live in, maybe this really shouldn’t have surprised me.