I know that the BIS says dos and cos.

When I am siming dos and •Kil'jaeden's vs. dos/cos, dos and •Kil'jaeden's are coming out ahead by 4k

When I am using dos and •Kil'jaeden's the other legendary I am using is the cloak. Then when I am using DOS/COS I am using wrists and cloak.

I guess I am trying to ask is •Kil'jaeden's better then cos?