Chiyo was better then Siannins back then since she said she fought Hanzo countless times. Eventually she could keep up with Hanzo with prep antidote. If someone where to make a a vs thread they have to add these important details like knowledge and preparation. If the OP was implying this then she can take this battle.
And who was the one that in the midst of a battle could prepare an antidote to all the poisons Chiyo ever had? Yes, Tsunade.
Look, people, the main thing with Hanzo was that salamander of his and the Gas poison that, at that time, people didn't had knowledge of, that's why he was called Hanzo of the Salamander, because of that poison thingy.
The rest, it's not such a big problem.
Plus, if we remember correctly, the Sannins didn't even showed to be fighting with their Summons.
I am talking manga here, not Anime where they included them as well.