Ming Hua is faster, like Waterbending Azula. Katara only won against Azula because of the drain water which wouldn’t help against Ming Hua

Ming Hua completely outstrengths, outspeeds and outsmarts Katara in every way.

Though I think Katara is a more powerful waterbender (I'd put her at #3), Ming-Hua would take this one due to location. The Crystal Catacombs have a lot of water for her to turn into Dr. Octopus. Though, I do think this fight could go to Katara if she was able to take control over the water Ming-Hua bends, much like Unalaq did at the south pole.

Wow finally, ppl have matured and realized Ming Hua is water ty lee and water azula 🙏