This one is A LOT more interesting to me. These two have chemistry and I love relationships where one is good but the other one is a villain/anti-hero. Besides, didn't Wonder Woman have her own male damsel in distress that she had a thing for? Besides, I never saw much of a relationship between Batman and Wonder Woman. Besides, a relationship between a hero and a villain where the romantic feeling is mutual, that's something rare and is always interesting.

I couldn't imagine batman and wonder woman together. So it's batman and cat woman for me :)

Love them together, I really can't see Batman with anyone else. Batman and Wonder Woman is a weird mis-match relationship together just forced with each other so that DC could have an, "all-star couple," if they did end up together. No doubt, that Batman X Catwoman is the more organic relationship, with a much more interesting set-up and story plot, and over time would probably have more chemistry then Batman and Wonder Woman would have being randomly stuck together.