Paper, much better for the environment.
Oh, we're talking sealant vs carnauba...
I like both. On my Arctic Pearl White, they give a different appearance, but I like both. It comes down to my mood, time available, season, etc... Sealants give it more of a crisp, in your face type appearance. Carnauba's give it more of a warm, shimmering glow.
But no matter which I use as my LSP, I like having a layer or two of sealant atleast for the added protection. I've also found that carnauba during the pollen season really attracts the stuff (did half the hood with each this past spring. Amazing difference).
Dave