Who is the strongest jinchuriki in naruto?

Answer 1

It is nine tails or the Kyuubi. However, Madar uchiha said that all the tailed beasts are fragments of the ten tailed beast called as the Juubi.

However, till now there has been no physical proof of it.

Answer 2

it is the ten tailed beast, but it did'nt exist, but recently, it is nine tailed demon fox.

Answer 3

NARUTO IS THE STRONGEST JINCHURINKI}