I think that DC just tends to showcase them more. In the comics, the female characters are usually in prominent positions, and some have gotten pretty successful solo runs (and the Birds of Prey is predicated around the idea of all-female superhero team).

By contrast, Marvel has traditionally tended to tie it's females down to teams (and even then have trouble pushing them into leadership roles sometimes). Now they're trying to fix that, but there's a case of "having to play catch-up" at work.

As for the films, in the MCU's defense, I can see why they did it the way that they did it AT FIRST!! No one had ever tried something like that before, and they weren't sure if it was going to work. So playing it safe, made sense at the time. However, NOW they need to start doing more with its female character (and since Ike Perlmutter, who apparently was the cause of a lot of these problems), is gone from the film division, perhaps they will start doing more now, we'll see.

And with WB/DC, there seems to be some "what did Marvel do well, and what have they been criticized for" examination going on. "Well, Marvel has gotten flack for being overly-cautious with pushing it's female characters, so lets start pushing ours right away" and all that. Also "people have been complaining for decades that we make all of these Batman and Superman films, but no Wonder Woman one. Well, lets finally give them one now," etc.