Kirin...also guys just to note you on this -
People think lightning is weaker because of that element crap, but its not...well not in Sasuke's case.
He is the reincarnation of the god of lightning himself Indra.
He has and always will have the strongest lightning to date.
Tobirama's lightning blade isn't pure lightning and sasuke did crack it, but he was an amateur and had 2 tomoe at the time.
Also note that, that was hebi sasuke...hebi.
Sasuke is way beyond hebi in every way except coolness also adding the fact that he has yin lightning too is just destruction.
Bijuudama RS is a big explosion but you basically only have pre shippuden kirin vs two's tbb/rasengan thing which is unfair.