The strongest jounin is Kakashi.
We can see that by observations of fights against Kakuzu, Hidan, and reading the Tsunade's phrase from 367 chapter of manga. Apart from his high skills [higher than other jonins(expectipng Gai's taijutsu)] he has the sharingan, which give him strong advantage by others.
Jounin... that is the strongest in Konoha... I have to admit it must be Kakashi...!
Well there are many reasons to that ^^ First of all... he is a "tensai" (genius) He may not have super powerful chakra attacks like we have seen on Tsunade, Itachi, Sasuke and many other characters.. but his knowledge and his powers are evolutionary thanks to his sharringan... Heck.. he can copy almost any jutsu with just one look... Sharringan is a must be scared of ability... It can see through anything from a Genjutsu, Taijutsu and other jutsus... If only he is not lazy like Shikamaru and train more instead of reading that useless porn book made by that ero sennin Jiraiya..
Legion Ketsueki Lives on~!!
I'm BACK AO!
excluding the sannins, (btw sannins are NOT jounins... they are independent ninjas.. some are more poweful than hokage
there's a tight match-up between kakashi, asuma and Gai sensei...
asuma comes 3rd...
that is true, definately Kakashi, especially since he can use the Mangekeyo Sharingon(excuse me if i spelled it wrong)
I don't know who is the strongest for sure but i think kakashi because he can use any jutsu that he sees with the sharingan and which is in he's power to do of course.