Sasuke and Naruto vs Momo was definitely badass, the synergy was second to none. It was the best fight so far as far as action and teamwork for the two go.
Some issues follow:
Super Momo was able to shrug off a Rokudo users chidori enhanced katana like nothing. Yet wasn't able to stand against a vanishing baby Rasengan by a baby and was floored by it. His body suddenly became flimsy and pathetic from being nigh impenetrable. Borat goes onto hold a giant Rasengan sustain it and use it when he can barely form and maintain a baby rasengan. While hding the rasengan he was able to form SCJ without his hands and divide his concentration from the Rasengan, catch Momo with a Boruto stream and hurt him (something even kakashi could avoid) then dodge his super human speed attacks and hit him with a vanishing rasengan again and hurt him (Rokuo chidori katana couldn't dent him). Then go onto finish SuperMomo and his super charged attacks with a rasengan boosted by a base Naruto who had to go Chakra mode to even fight and hurt Super momo. Yeah and momo gives a seal from his rear end and still no explanation as to why. Just my objective critical analysis of the situation I should think that covers a lot.
Based off of that theirs was the best fight hands down the let down were the issues I raised.