Best/strongest? Easy to get

Then it is sage naruto, fire main, iruka, hashirama (normal).

Iruka buff naruto and hashirama buff naruto. Fire main can reflect debuff.

Hashirama chase got interupt. And also his mystery immobile 2 units every round (prompt barrier if mystery SB)

Iruka got interupt.

Fire main got shield mystery. Ignite/sleep standard. Then if you got KOH summon, its all in the package.

So many interupt, so many shields. Safe to play cause reflect and mystery shields. Plus the rework sage naruto is stronger and hit harder than kurama naruto.(in terms of damage).

Sage naruto? Easy to star. Iruka? You can 5 star him easily and if you got high resistance then shield can go over 5k.

You know the new passive of sage naruto? Gives 30 chakra and removes all debuffs to 2 senjutsu user every round.

Classic sage naruto, bee sst and gaara(any as long as has immobile).

Scarlet or breeze.