Are people seriously say itachi easily. Lmao the winner which would most likely be itachi but would take it with high difficulty because they more or less have the same technique's in relation to the e/ms.
The reason why sasuke would lose is that against somebody like itachi who is serious to end your life, the tiniest of mistakes would cost you the fight. Sasuke last fight against danzo he gambled alot and danzo had him, from grabbing his neck, to binding him with a curse and took too long to cut sasuke's head off. What im saying is that against itachi, sasuke cannot gamble like this.
Anyway the recent manga chapters has made it very clear that itachi is still the superior of the 2 brothers