Sasori can defeat the current sasuke 1v1, multiple reasons why
1. Sasori is highly analytical and cunning vs Sasuke's pig brain
2. Iron Sand > Susanno
3. Iron Sand + Sasori's poison > Susanno
4. Due to the Iron Sand being derived from the Third's ability to convert chakra to magnetism, this grants Sasori immunity from metallic weapons. <-- from wiki, no sword buddy
5. Red Secret Technique: Performance of a Hundred Puppets > Sharingan
6. Also, normally a puppet's movement is dependent on the will of the user, and as such there will be a time lag between the user's commands and the puppet's response. However, since these hundred puppets are directly connected to Sasori's core, there is no time lag between Sasori's will and the puppets' movements. <-- naruto wiki
7. Sharingan Genjutsu wont work against a puppet since they dont have eyes
only think sasuke has going for him is his Amaterasu, imo Amaterasu < Red Secret Technique: Performance of a Hundred Puppets
1. Sasori is highly analytical and cunning vs Sasuke's pig brain
2. Iron Sand > Susanno
3. Iron Sand + Sasori's poison > Susanno
4. Due to the Iron Sand being derived from the Third's ability to convert chakra to magnetism, this grants Sasori immunity from metallic weapons. <-- from wiki, no sword buddy
5. Red Secret Technique: Performance of a Hundred Puppets > Sharingan
6. Also, normally a puppet's movement is dependent on the will of the user, and as such there will be a time lag between the user's commands and the puppet's response. However, since these hundred puppets are directly connected to Sasori's core, there is no time lag between Sasori's will and the puppets' movements. <-- naruto wiki
7. Sharingan Genjutsu wont work against a puppet since they dont have eyes
only think sasuke has going for him is his Amaterasu, imo Amaterasu < Red Secret Technique: Performance of a Hundred Puppets