its already been stated that the uchiha and the seju were the 2 strongest clans both decendent of the sage of six path but to say who is stronger is impossible becuse it all comes down to the individual ninja there were clearly senju who killed uchiha and unchiha who killed senju and even tho the first hokage defeated madara dosnt mean the senju were stronger jus that the first came out on top during their fight and that dosnt even mean he was strongr then madara jus that he came out on top that day if u watch real fight and bear with me i know that this is a cartoon not reality but if u watch fights 2 of the same people can fight countless time one wins one day the other wins the next day so in closing my statement hereagain i beleive that they are equal and it comes down to the individual