I've used both the denimstyle and tlccotton plus. Love both of them and they wash wonderfully, very soft. The denimstyle would be your best bet for the sweater as the cotton plus is more polished and a dk weight. The denimstyle is fluffier and more sweater-like.
Oh yes and that's a gorgeous sweater, have added it to my faves...
I'm MWhite on Ravelry, too...add me to your friends