I vote for Lucy. I just read the manga.
Lucy Vector isn't something Naruto can handle. Her Vector is Invisible/Phase, Naruto can sense it. But Naruto cannot dodge all those Vector at the same time.
Ex: Naruto when he was fighting 1 Madara Limbo, He could not see it, But He can sense that Limbo and He had hard time dealing with 1 Limbo (Naruto had to used Clones to stop it).
There a Huge Difference between Limbo and Lucy Vector. Lucy Vector isn't Physical Form, It can phase through Solid/Liquid/Energy, while Limbo is only Invisible.
Dont even think those Vector are slow, they are much faster than any Naruto Attack, It can cross the planet with just couple second. Her Vector alone reach outer space and right back to her instantly, Naruto doesn't have any attack speed that can equal Lucy Vector speed. Unless You have evidence that Naruto can Instantly Charge Biju Dama and Throw it at her instantly. Cuz Her Vector travel through outer space and shot it back down to earth instantly (Even if you calc that with 1 second).
Let see Outerspace is like 50miles from Earth (But Im sure this Pic below is more than 50 miles from earth. but let just use it.
50 Miles / 1 second = 180000 miles per hour speed..
Now they are in Forest of Death, what make you think Naruto can dodge all those Vector? Pretty much all Lucy Vector would be appearing infront of naruto almost instantly at that close range (10km radius = 6 miles)
If 1 of her Vector Touch Naruto body, Its over for Naruto. Lucy can easily take out any Organs from Naruto Body..
If Lucy Vector touch Naruto Feet, Naruto would be crippled and Unable to move.
I have never seen Naruto even able to dodging Multiple Attack at Once, He use his Cloak Chakra to Protect him.. Lucy Vector will just go through Chakra Shield No Jutsu and Pretty much Naruto cant do anything.
Obito alone was able to touch Naruto, Lucy Hundreds of Vector coming at any direction and much faster than Obito. Obito also manage to phase through Chakra No jutsu. Naruto doesnt have protection against Lucy Vector.