That is an interesting question.
In the 80s, it was about equal for me. I had my core titles I liked on both sides of the fence. But then the 90s happened (and everything that went with it) and Marvel was hit hard. The books became ugly messes.
While DC was affected as well to some extent, you also had things like Vertigo starting up. You had the lighter side with the JLI. It was still fun. I pretty much dropped all my Marvel stuff by 2000.
Every now and then I peek back over at Marvel and it seems like every single crossover is heroes fighting heroes, going back to at least Civil War. I just don't find that interesting. So sadly, while I enjoyed Secret Wars, there was so much lost on me because I didn't follow the Avengers' years of build-up.
But I loved Superior Spider-man and was sad when it ended, but kept up with the title...until Secret Wars changed him to Tony Stark-lite. I couldn't make it to issue 3.
And I'll always buy a She-hulk book, she's probably my favorite Marvel character. I think the only Marvel titles I'm currently following regularly are Old Man Logan and Darh Vader (and I'm not even a major Star Wars fan).