Obviously, Madara's looks (and most likely IS) far superior to Sasuke's. But you ust remember, Susano'o Differs from one individual to the next. Itachi's Susano'o manifested the legendary weapons Totsuka blade & Yata Mirror. Sasuke has a sword that automatically activates his inferno style jutsu and sets ablaze anything it touches with Amaterasu! In Madara's case, he hasn't any spectacular weapons or anything, but what he DOES have is a Susano'o that can freely walk, run, JUMP!, AND CAST NINJUTSU BY ITSELF!!! Also notice that Madara NEVER ONCE manifested the torso alone in a COMPLETE form, but only in an incomplete form. When do we FINALLY See the complete Susano'o?
Now here's a question. . . WHY DIDN'T HE JUST USE THE COMPLETE TORSO AND SAVE SOME CHAKRA? He's already proven that he doesn't just go directly for the kill blow, but instead plays around with his prey. So why did he just go directly to a full body complete susano'o? I think the answerr's obvious. He CAN'T!!! If he goes beyond incomplete, he is forced to use the full body.
This information is here to clarify that the full body Susano'o is Exclusive to Madara, except for possibly Izuna, who was said t be equal in every way until Madara took his eyes.