I was wondering if anyone has tried them side by side and could offer their opinion on the two. I tried both, but at different stores. I know the D-16GT has mahogany sides and back, whereas the D-16RGT has rosewood. Both have spruce tops and that "Martin sound". Is the D-16RGT darker because of the rosewood? Or does the side and back material matter at all and the main difference is the ornamentation and inlay?