15 rockets to destroy an Armored Wall. That's 21,000 sulfur in raw materials.
8 C4 charges to break an Armored Wall, roughly 17,600 sulfur plus metal fragments and tech trash.
46 satchels to destroy an Armored Wall in Rust.
The cheapest explosive option for an Armored Wall is 8× C4 at roughly 17,600 sulfur.