It is not only about rendering

Although the speed is faster by an order of magnitude and better too. And it render multipass to Photoshop.

But he real advantage is to get your model into an environment that has no limitations. In addition to render you have a full fledged high end modeler to you disposal and with Kuroyume's InterPoser Pro plugin you can pose and morph your figures just like in Poser. (He is working on a Genesis version).

None of the other high end modelling tool has this close connection to Poser. There is Poserfusion but it is very limited in comparison.