Still much easier to UV map a sub'd mesh than a somewhat messy mesh generated from Nurbs Surfaces.
Also you have to be really careful to keep your normals data intact before rendering a nurbs generated mesh.

With Sub'ds you can model anything you think of. Modern retopology tools are overcoming many of sub'ds shortfalls. Its still time consuming though.

Nurbs are really at their best for hard surface objects.

I don't know if it will ever happen but a program that has the speed & power of nurbs and the tweakability of sub'ds would be really cool. Modo's meshfusion is an attempt at this but still generates a messy mesh.