I can't give an order yet:
Netero whole fight with Meruem.
Also Meruem doesn't giving a damn at the end and just wanting to reach Komugi. I hope Pariston will not mess that up.
Kurapika kidnapping Chrollo and all the drama/mud stuff happening on both sides about what to do with Gon and Killua. Also when Gon and Killua were first captured and Nobunaga wanted to recruit them.
I'm just going randomly on great moments but there are really too many lol.
Gon renounce his everything in order to fulfill his primal desire to destroy and take revenge on Pitou.
Gon fight with Gensuru (the bomb devil in Greed island).
Also the process of getting the cards in Greed island while at the same time they were getting better as "nen fighters" (hunters).
Amd I'm already at 6 so I will stop here.