Sasuke > Itachi
I'm terribly bored, and I never make threads, so why not? To most, this should be obvious, but then there's the minority who cant accept it. Sasuke surpassed Itachi the moment he got EMS. People also must understand Itachi was a medium for Sasuke to surpass in the first place, that was his original goal, to find and kill Itachi Uchiha.
Anyway, lets get into it.
Itachi cannot utilise Tsukuyomi, as Sasuke already broke it. Now, this is one of, if not Sasukes' biggest advantage. Why? Because Itachis' fighting style revolves around genjutsu, and by breaking Tsukuyomi, he's rendered all other genjutsu useless. We've seen Itachi on a couple of occasions, Itachi defeating his opponents with genjutsu alone, as seen with: Deidara, and Kakashi. Again, this is a major setback for Itachi. With his revolving fighting style now pointless, the tides are turning in favour of Sasuke.
Now, the question isn't whether Itachi would use this on Sasuke, but when Sasuke would use this on Itachi. Sasuke has mastered Amaterasu on a whole new degree, able to manipulate and extinguish flames. This is useful on a number of grounds. If Itachi were to use Amaterasu on Sasuke, Sasuke could simply manipulate it, or extinguish it. Sasuke is just much better at Amaterasu than Itachi is. Also, if Sasuke were to land a hit on Itachi, he'd be in a heap on trouble. Itachi is able to counter Amaterasu, but that'll surely take a lot out of him. It is further useful on the grounds of close combat, and defense.
It's no secret Itachi is a better Taijutsu user, but with Enton intact, Itachi won't be able to land a hit, unless he wants to loose an arm/leg. Itachi'll have to be on the defensive.
Itachis' Susano'o is superior due to two things: Yata mirror, and Totsuka blade. If it ever comes down to them using Susano'o, Sasuke will have to retreat, and force Itachi to remove it. Itachi has incredibly low stamina, 2.5 in the Databook to be exact. Sasuke is airborne with his Hawk summoning. If Itachi threatens with the Totsuka blade, Sasuke can get elevation, and wait until Itachi can't maintain it any longer. Sasuke has already claimed Susano'o puts a great deal of pressure on the body, and due to Itachis' conditions, it's not getting any better for him. I understand Totsuka has a great length, but no matter how long it is, it cannot stretch as far as a creature capable of flight. I once debated this before, and my opponent claimed Itachis crows can bring Sasuke down. This is false, Sasuke can take them all out with Chidori senbon, he can use it to the same scale as when he used it against Deidara's C1 bombs.
As I've stated previously, Itachi is superior in Taijutsu, but this can be countered with either Enton, or Chidori Nagashi. Since I've used Enton previously, I will use Chidori Nagashi. Itachi has shown enough skill in kunai to be dubbed the most proficient at it, in my eyes anyways. However, Sasuke is able to charge a Chidori current down the blade, which has been shown to penetrate kunai, as seen with Yamato.
Look here. With a simple push, he was able to paralyze Sai, and Naruto. Itachi will have to be careful if it ever came to close combat. Also, check Yamato, kunai's are pointless when the blade is covered in a chidori current. With Chidori Nagashi surrounding his body, and a Kusanagi blade covered in a chidori current, Itachi cannot really utilise his Taijutsu properly. Itachi is in threat of seriously getting injured, or paralyzed. If he does, it's safe to say it's over.
Some of you may say Itachi can use Suiton to electricute Sasuke, however, this has been attempted before, but to no avail.