The moment you make it a Marvel vs DC thing, is the moment you lose all credibillity. It's all very subjective when it comes to movies, books, games, whatever, and especially characters. To simply say that "DC has the best characters" is both ignorant and ill-informed. Pick 10 books from each company, and chances are, you'll find differences in all of them. Sure, DC has such classics like Wolfman on TT & Deathstroke, but Marvel also has Moench's Moon Knight and Claremont's X-Men. Meanwhile, DC has the abomination known as Batman: Odyssey, and Marvel has the Fight Club issues of Thunderbolts.
I never liked comparisons, for the simple reason why there's almost always dead-wrong. Thunderbolts, as least during its inception was nothing like Suicide Squad. They were villains trying to pull a con, and in the end, some decided to give the hero thing a shot, out of their own free will. Compare that to SS, which is a black-ops approach to using villains due to their ependable nature. Both use the themes of redemption, but take very different approaches. The age old "Moon Knight is a Batman rip-off" is so idiotic I'm not even going to dignify it with a breakdown. Likewise, Aquaman did come after Namor, yes, but the concept is so ingrained into popular culture, I don't consider it a rip-off. Some concepts are going to be similar, no matter what.
What I'm trying to say is, this is a "fight" of good, or at least mediocre and well made movies versus badly made and disjointed flicks. I'd like to think nodoby has a "horse in this race", and people's opinions are unaffected from studio politics and the like. Folks just like what they like, I don't see the need to bring childish rivalries into this, especially poorly constructed ones.
PS: Info on the muddled production:
https://www.comicbookmovie.com/suicide_squad/was-suicide-squad-doomed-from-the-start-shocking-new-details-on-the-a144173