Not really modellers, although both will let you build simple models out of primitives. Bryce also allows Boolean ops and offers netaballs, but with skinning, some kind of lath and all the other standard 3D tools, both are way more rendering/scene creation 'ware than even basic model 'ware.
I don't do much of my own modeling anymore. When I did it for money I used Visual Reality 2.0, which is no longer available.
Animals and people are very hard, especially if you intend to animate them realistically. I bought animals and people when I worked for clients and added the cost to the expenses on the projects. Mostly, I modelled weapons and vehicles. Bryce and Poser come with Gigs of stuff. Poser will output into obj and a bunch of other formats to allow poser people to be used in most 3d wares.