Madara Uchiha is definitely the strongest known member of the Uchiha Clan and would be able to defeat Itachi. Sure, Itachi was exceptionally talented and powerful, but he never really got the chance to surpass Madara.
INFO...
•MADARA UCHIHA VS ITACHI UCHIHA
•THE GHOST OF UCHIHA VS UCHIHA SLAYER
Genre : Action
Running time : 3 to 4 min
[FAN ANIMATION]
WATCH EPIC BATTLE
PART 01
PART 02
JANTY ZONE !