Although, I think I have to go with Zutara. I love Kataang a lot though. I like how there so sweet toward each other and their personalities fit perfectly with each other. I also like how Aang and Katara grew up with each other, and Aang had always liked her and Katara soon liked him back. Their relationship is so sweet, but something about Zutara is just a little bit better! I love Zuko, but since he sometimes has temper problems sort of, I think Katara is the type of girl who can help him. Zuko and Katara's relationship is so interesting and since opposites attract, I would have to go with Zutara. They look so great together too. Besides, Aang is actually old for Katara! He's 112!
I'm not trying to be rude, but just because Katara and Aang kissed doesn't mean they love each other and how do you know they loved each other during ATLA. They do prove that Katara does love Aang because they were married. And Zuko is not waaay older then Katara, he's only 2 years older. And the reason they moved away from each other in the Ember Island play is probably because if they did people would think they were dating and Sokka would probably hurt Zuko BADLY!
aang!! and btw aang is technical is 112. in lok they got married and they love each other so yeah aang. she doesn't even like zuko. in the ember island players episode after they saw their characters like that they didn't even want to sit next to each other.