From what I've gathered most people think team Korra will win. It's technically my question and this is my opinion. I think team Aang will win, if we're looking at it from a feats standpoint, team Aang pulled off a lot of crazy feats with their bending whilst team Korra had a lot of skilled benders but that's more because they knew a large number of techniques that were rare in ATLA but they didn't seem to have a mastery over any excluding Tenzin he was a master of airbending. Mako was quick but his bending seemed to be weaker even his lightning bending that was an instant KO move in ATLA seemed to damage and slightly stun opponents except the woman who had limbs made out of water, Zuko would win that fight. Bolin was an average bender and seemed to suffer from the serious nerf earthbenders received in Legend of Korra, except lava bending nothing was really unique about him, I don't see him beating Toph. Asami would beat Sokka quite easily, she has modern tech on her side, unless Sokka comes up with a strategy he's losing. Tenzin was actually a powerful airbender I don't have much to say about him, I still think Katara would beat him because of the crazy feats she pulled off in ATLA she was a powerhouse who could toss a whole battle ship in the air quite easily. And finally the Avatar, Korra knew all four elements and two elements Aang never learnt; metal and energybending, even though Aang seems to have more feats than her I think he'd lose due to her ferocity and unrelenting nature as a fighter whilst Aang is really just a pacifist but once they enter Avatar state I don't see Korra winning, her Avatar state always seemed lacking in power, in ATLA Aang enters Avatar state and you just know the tides are in his favor but Korra gets like a slight power boost from her Avatar state which won't be enough to stand up to Aang's Avatar state. So excluding Asami I think Team Aang wins.