So about Sasuke's EMS

[Shunsin no Shisui]

The only new ability sasuke's susano has shown after unlocking EMS of course, is amaterasu yasaka magatama. I still don't think it's anywhere near stronger than madara's perfect susano.

 

[kevenc]

EMS only prevents Sasuke from going blind.

 

[Fearmonger]

EMS only prevents Sasuke from going blind.

It also gives Sasuke more power.