Mu has more of the advantage by flying
Mu is a sensor type so his puppets wouldn't be able to sneak up on him
Mu dust element would destroy most of the puppets in one shot
Posion gas could be blown away with his wind style
The only chance sasori would have is with scratching him with his poision but that be real difficult so i'm giving this to muu
Before Muu disappears only thing Sasori gotta do is shoot his 1000 poisonus senbon in the area he ust vanished from
But honestly Sasori is one of the strongest people on the show to fight with no information
And even info doesnt win the battle, cause nobodies perfect an are bound to make mistakes, which in turn ends the battle