I wouldn't necessarily fully agree with the premise, if we're putting this in the scope of media adaptations, basically anything that's not a comic, like the Netflix series with Elektra, Colleen Wing, Jessica Jones, Misty Knight and the Night Nurse, the primetime television audience with Agents of Shield with Melinda May, Mockingbird and Quake, the Animated side with White Tiger and She-Hulk.
Keeping that in mind, Marvels prominent cinematic universe is on the big screen. They set the stage for the Avengers with Ironman, Thor and Captain America and gave them love interests to act as a grounded counterbalance. Thors ethereal and full of himself, Jane is a determined theoretical physicist. Tony is Livewire, Pepper is that responsibile executive telling him no and struggling with the chaos that is Tony Stark. Cap is optimistic, Peggy is worldweary.
Switch it up to DC.
Arrow: Female combatants galore with Shado, Sara, Nyssa, Lyla, Thea & Laurel, all with varying arcs at different points. There was a female villain trio teamup this past season which was a natural progression of characters from past episodes.
The Flash has Jesse Quick and Killer Frost, but is generally more scientist based than cadre of fighters.
Supergirl has the title character obviously, as well as Miss Martian, as well as featuring a numb of powered villainess' like Silver Banshee, Indigo and LiveWire. And Alex Danvers as an obvious derivative of the MCUs Black Widow.
Gotham features the very iconic character of Selina Kyle. Has also featured Lee Tompkins in a very relevant to the threat of the week medical examiner role. Fish Mooney, distinctive character that stands out, irregardless of where she falls on the spectrum of fandom to hatedom. Barbara Kean as a proto Harley Quinn. Poison Ivy, another iconic villainess and Tabitha, given indications of forming the future Catwoman.
Then there's Lucifer, wherein Maze is an asskicker and her personality shines through.
IZombie, no inclination to see it soon given how far removed the announcements made it clear it would be from the source material, which I thoroughly enjoyed when it was being published.
Actress strongly resembles Gwen Dylan, the showrunners previous series Veronica Mars shows he has talent as a showrunner.
Preacher, they adapted Tulip. They heavily changed her, but in many ways its an extreme version, a leveling up on the Tarantino-meter, which works with Preacher, even if I would've preferred the writing stay somewhat closer to the source material with her character.
Legends expanded on Sara in the White Canary role, brought forth a Hawkgirl central to the season long arc and romantically entangled with one of the more established actors, notable for playing Superman. Season 2 brought a time displaced Vixen to act as a quasi audience member point of view character and also tie in to a generation of superheroes tied to one of the most popular era's in fantasy writing (WW2).
And Black Lightning will be bringing his daughters powers to bear as Thunder and Lightning if the trailer is anything to go by.
So, maybe it comes down to there's a human girlfriend formula with the Marvel films and the DC tv side isn't as defined. Arrow has street fighters of both genders, the Flash leans heavily on their scientists, Legends is anything the creators wanr it to be, Supergirl focuses on the female leads with viewership demographics in mind most likely.
Gotham has the biggest DC franchise to work with, with many iconic characters to adapt.
Lucifer intermingles metaphor, family drama, relationship hangups, action and suspense and comedy very well that even average scripts are a fun ride and the characters all have distinctive roles with both genders.
The television side allows DC to do more, so the comparison isn't entirely fair. Its comparing a little over a dozen 2 hour movies to hundreds of hours of television between all these shows.