It depends which Superman shows up. If it's the toned down Superman, then WW may be the top gun. If it's the Superman who can lift the weight of the Earth and then some, then Wonder Woman has more to prove before we can say she's the top gun. It could go either way at this point.
As far as I know, her editor got her fired, but DC brought her back because they didn't think she should have been fired. Or at least that is the talk that is going around.
I think they just want to keep their female writers so they can avoid all of the sexist remarks.
I read a couple of rumors about DC wanting to do awful things to Batgirl, and Gail refused so they let her go, and another about them turning her into a "slut" and she refused (which I can't say I blame her).