This picture shows a comparison between Premier Sweet Roll yarn (the large cake type of yarn) and Caron Simply Soft. The Sweet Roll yarn is a bit thicker than CSS.
Personally I think the pattern shows up a little better on CSS, but you may have a different opinion (the lighting is not great in the photos). Also, I tend to warp a bit loose, so my patterns may show up differently than yours.
The Sweet Roll yarn was not especially difficult to weave despite its being thicker than CSS. I think the CSS square has better drape. A project made using PSR will likely be a little heavier and stiffer.