I tend to prefer the leather, but once in a while I love signature. I have a signature in red and I like it for the size.
Most of the time I like the look and durability of leather (the pond and sable colors are beautiful!) But some bags for their shape to me, look better in canvas. I love the med carly bag in the black canvas. I tried the leather, and it just didn't look as refined in that case- something about the shape of the purse. So.. a little of both. Just er on the subtle side with the labels.