The similarities between Wonder Woman and Xena are like the ones between Batman and Judge Dredd.
They are both great fighters, both battle criminals, both have an arsenal awesome equipment to back them up and both wear costumes with conceal their faces and have animal emblems on them.
But their motivations and their characters are, beyond these initial similarities, entirely different.
It's possible to like both characters, but not because they are almost the same because, really, they aren't.