Both pretty similar as you can see.
I'm going to say Xena.
Xena is far sexier IMO. The fact that she's a bit more rough around the edges makes her far sexier.
Also I prefer her backstory and character, and she has WAY better villains. Callisto and Ares and Alti are among the best villains in any tv show. Wonder Woman kind of falls flat however with her badguys.
Also I think Xena was quite a good role for women because she got knocked about more. That's the real reason we don't see more female heroes. Its because people don't like seeing a woman get beaten up, tortured, etc.
Compare Buffy and Angel. Did Buffy ever get tortured? Angel meanwhile there were whole episodes were the plot was basically he gets strung from the ceiling and tortured for hours.
Also compare the X-Men. Wolverine the main male character of the franchise gets tortured and knocked about all the time. When there is a poster of Jennifer Lawrence being choked however feminists get it pulled down.
With this in mind, its no surprise that most people just settle for a guy to lead an action adventure series, as it's more exciting because you can have him really get his ass kicked, where as a female hero has to be more of a boring all perfect hero.
Xena however bucked that trend. Xena got tortured, crucified, had her back and legs smashed, got killed about six times, her head cut off, strung from the ceiling and beat with clubs.
I will say though that I prefer the Wonder Woman theme. Also Xena season 5 is without doubt one of the worst ever television seasons. Its a classic example pre New Who of not letting unprofessional fanboys or girls in this case from getting hold of something. TBF though at least the people behind it admitted they fucked up royally unlike New Who. To think Steven Moffat actually thinks he did a good job with Missy and convinced people who weren't sure about a female Doctor that it would work