This really is a thing. I was shopping for a bluegrass dread and was just trying a bunch to find something that jumped out at me. A sales guy said if I normally sang much to be sure to sing with them. I was shocked at the difference the guitar made. Rosewood is much easier to sing with for me.
On the whole hog vs rosewood: I kind of like Madagascar rosewood to fall in between the two. At least that’s what it does for me.