Who do you think would win in a battle under the full moon?
I'd back Hama.
If her bloodbending works, then it's a one hit KO. If Pakku can resist it and they have to duke it out with conventional waterbending, I think Pakku's style is too defensive and predictable for him to ever take the upper hand. Hama can do a lot more with a lot less water. If they're in a place with a lot of water, Pakku can maybe pull out a draw, but I think that's the best he could hope for.