i think the strongest in naruto where the manga currently
1.sannin[not tsunade]
2.the stronger aktasuki members such as there leader itachi sasori
3.current kages
4.weaker aktasuki and stronger jounin

the sannin are at the top because they are the most experinced and are ledgenary for there strength.

we know some of the aktasuki are kage level and we know this some have killed kages
and some are just very powerful also there leader also must be very strong oterwise the
aktsuki would not listen to him

the kages are the strongest ninjas in there village so are very powerful

strong jounin such as gai kabuto and kakasi and asuma are most likely around the same level as the weaker aktasuki