Allura vs Korra
Okay now while Allura is Physically stronger than Korra with her ability to Morph into other species and how she manhandled Zarkon’s Hench Man on his spaceship when sneaking on.
And while she had that BADASS FIGHT against the Witch and her men on the Season 2 finale
I’d give the slight edge to Korra because Korra has all the elements on her side and is more of a Brawler MMA Fighter
also when she unleashes her Avatar State she becomes a force of nature and could overwhelm Allura by using Earth, Metal, and Air.
Gotta go with Korra there since she’s more of a combatant