Having better eyes doesn't mean sasuke is stronger. Itachi is more skilled than sasuke, he knows how to use sharingan techs better and is very good at analyzing how to take down sb( as shown with nagato).
If ino had 100 kunai as well as paper bombs and itachi only had one kunai(no genjutsu or ninjutsu for both), would ino win? Nooooo.
But I admit sasuke has gotten pretty strong, itachi would win with high diff.