Someone please check my math but this is what I am coming up with:

In a ton you get 181.98 gals of AccesS if its weight is 10.99   (.76-0-0-1.86S per gal)
in a ton you get 180.18 gals of ATS if its weight is 11.10  (1.33-0-0-2.89S per gal)

So you get 239.64 total pounds of N and 520.72 total pounds of S with ATS
You get 138.30 total pounds of N and 338.49 total pounds of S with AccesS

Personally if it was me I'd be asking them why AccesS isn't priced lower then 20/ton