He has the upperhand in pretty much everything but destructive power.
Summons alone would be troublesome.
Fire Style and Needle Jinzo are way faster than anything Onoki has.
Oonoki is a team player..he needed help or assistance in every fight or sequence in the great war and against madara...jaraiya on the other hand went toe to toe with pain and his jutsus are far advanced plus he has the toads...summonings..sage mode..genjutsu..variant rasengans..various elements... The list goes on and on..j-man takes this
Let me see, a great sage who is strong enough to be the kage of the most powerful village in the naruto verse vs a senile old fool with one good jutsu? Tough one