Criollo 98 wrapper from WLT is quite thin and stretchy, with a lovely, subtle flavor and aroma. Nicotine is mild. I highly recommend it.
The Rosado leaf is somewhat thicker, with slightly less stretch, but greater tensile strength. It's nicotine is medium+, and should be taken into consideration when blending. It provides a somewhat rounder, fuller flavor and aroma. Cigars wrapped with this are visually stunning. I highly recommend it.
Which do I "prefer"? I can't really answer such a question. They are both delightful and excellent wrappers. They differ.