Fox has access to great female characters (in X-Men), but fails to use them well (same as males). Storm is great, Jubilee is great (barely did anything in Apocalypse, I didn't even remember her being in X2), Psylocke is cool (did nothing in Apoc, bad actress although still hot and the costume was good), Storm is great (Halle Berry was meh, the new girl is hot and at least they did a little with her background, thief, Egypt, etc.) White Queen is sexy (probably the character most fucked by wonky continuity). I liked the Jean Grey/Cyclops interaction in Apocalypse and it looks like they are finally gonna do Phoenix for real. I know people didn't like her acting, I thought it was fine. Famke was great although they fucked her over in X3 and screwed up Phoenix.
Basically Fox throws way too many characters into every movie so we have no time to get to care about them.
MCU women suck so far. Black Widow should be Russian. Scarlett Johanssen was hot although she is getting up there in age now. She can't act. Whedon screwed up the relationship with Hawkeye, threw in the Hulk thing and 'I'm an infertile monster' out of nowhere. Scarlet Witch is good although her new origin is dumb. That's it for movie women except for the girlfriends. They're all pretty hot, oh and Kat Dennings has a nice rack. Valkyrie should be blonde and white, wtf. Gamora is meh, Nebula is a loveable bitch, Mantis is cute but nothing to do with the comics. If we are counting TV I like Quake, and Jessica Jones is well-defined but a bitch. Deborah Ann Woll is gorgeous.
DCU only has Wonder Woman so far. She has been the single best female character of all 3 studios. Faora was awesome. Amy Adams is hot but looks nothing like Lois Lane should. Doctor Poison managed to be both over the top evil and sympatgetic.
Tl;dr:
Fox: best selection of characters but does nothing with them.
MCU: Mostly suck except for TV and a couple of GotG girls.
DCU: Best character, others are promising but we're only 4 movies in.