Kizaru's conflict was more touching and impactful but the buildup and overall execution was not enough. It might improve when we get more info on him.
Kuzan's had better buildup and better execution but I don't think it felt as emotional as Kizaru's.
I'm ultimately voting Kizaru, partly out of bias, but also because I think his conflict has more overall potential regarding his future in the series.
I'm just 50/50 on what'll happen to him. Is he a future Zoro/Sanji victim, will he betray the WG in an impactful way, will it turn out that this was a false alert and it turns out he was more evil than we thought? etc.
I just feel there's potential there. There's got to be a reason Oda went out of his way to portray him this way, constantly make him play around in almost every fight he's been in, never use an animal themed attack, directly portray him as a foil to Luffy (Monkey vs monkey, same bounty, theme of being a slave as opposed to being the Warrior of Liberation) etc.
He feels like the most "held back" Admiral overall and I think Egghead might really change that for better or worse.