Power wise
Naruto
Hashirama
Hiruzen
Minato
Tobirama
Tsunade
Kakashi
Effectiveness wise
Naruto (for trying to advance the world towards a peaceful utopian society)
Hashirama(started ot all amd maintained the premise for a village)
Hiruzen (worked towards peace and at least had some form of stability among nations)
Kakashi (wasn't even kage for long but at least maintained some form of stability and did not digress the village and maintained diplomatic relations)
Tsunade (Same as Hirizen but to a lesser extent, not above hiruzen or kakashi since Gaara was ancillary to the reason it worked in the first place)
Minato (decent but wasn't really effective for long since hiruzen still had influence but he maintained some form of stability)
Tobirama (probably caused a lot more problems than good not just for the village bit for the world. Reanimation, uchiha displacement, aggressive tactics, etc.)