Luster vs cotton rag photo paper

[Kit Lens Jockey]

I was about to make another order of photo paper from Red River Paper. Up to now I've always used luster paper, with pretty good results, but I'm curious about trying cotton rag paper. I print mostly landscapes. Anyone have any opinions on the two compared to each other? I'm concerned the colors might be less vibrant with the cotton rag stuff, since I assume it's less shiny than the luster. But it's much more expensive than the luster, so it's gotta be better, right? ;D