Pain, low - mid diff.

I dont think boros poison would work on the pains so pain wins

Virus wouldn’t work on puppets

In my opinion Pain low diff

#1 can Absorb lava style

#2 Virus won’t work

#3 Has the power to destroy his core in one blast

#4 Faster than boro

#5 More durable than boro, tendo tanked a bijuu bomb at point blank

#6 Can react to lightning blade at point blank. Meanwhile boro got blitzed

Two users of Chidori and Raikiri don't travel at the same speed

True Kakashi’s lightning blade is even faster

Pain ends him with 1 rod.