He was best as a Sasori fanboy

.
And, Sasuke has an edge with evading the puppets thanks to the Sharingan, the curse mark can allow him greater agility in a partial use or he could flat out fly away to avoid any dangerous attacks from the Iron Sand. I believe the Multiple Puppet swarm would give Sasori the win; But Hebi Sasuke's evasive abilities would make it hard to land a blow with poison.
I could see Sasuke managing to dodge and run around the Iron Sand, trying to land a Chidori spear at the Third Kazekage Puppet. And isn't Lightning>Earth techniques. . ? Is the Iron Sand not considered an Earth technique?