I of corse mean Lord-Madara...
And let's say A: a healthy Itachi
And on the other hand: a sickly Itachi... I'm fairly confidant even the weakened Itachi would have been able too survive that cheast stab... Unlike his brother...
I feel others would agree with me that a healthy Itahi might even give Lord-Madara a good scare :3
I like both Itachi and Madara and there's no way Itachi could have lasted long if Madara was serious which he wasn't against Sasuke, the alliance or the 5 kages. The only healthy Itachi we know of is the 13 year old Itachi so no he wouldn't have done better than Sasuke and Sick Itachi would have his illness, going blind, MS pain side effect which is even worst due to his illness and low stamina. Madara mastered the Sharingan far beyond any other Uchiha and Izuna or Obito would likely come in second and third with Sasuke and Itachi next since we don't know about other Uchiha's stats.
Madara shown to have high stats in speed, taijutsu, kenjutsu, Genjutsu (Madara control Kurama with only 3 Tomoes when Itachi stated he needs MS for that feat), physical strength, durability, endurance, stamina, chakra, battle experiences, ninjutsu power, enjoy fighting (Itachi was a pacifist). EMS Madara is on levels above kage level (where Itachi is at with the 5 kages) along with Hashirama, Tobirama and Izuna.