i think out of control is stronger than in control but thats just me
No, because the Tailed Beasts actually lack the intelligence to use their power properly OUTSIDE of a host.
Naruto without control of the fox, in six-tailed mode would succumb to animal instincts.
I think Bee has the advantage of being able to control such power, but he lacks the corrosive (ability to burn objects that touch him) cloak. I am not sure if he can use any sort of ninjutsu while in that form, since you have to be fully transformed in order to do the Biju-Dama.
Naruto however, has an advantage of nearly perpetual chakra, even the Hachibi has come close to running out of chakra if you've read the fight with Kisame. Naruto however, cannot make any form of strategies as he is a bestial dumbass.
I think Bee takes this one, but if Naruto had control over a form like that then Naruto would win.