What are some alternatives?
When comparing Chief Architect Premier and Maya, you can also consider the following products
Cinema 4D - Cinema 4D is a 3D modeling, animation, motion graphics and rendering application.
Blender - Blender is the open source, cross platform suite of tools for 3D creation.
ZBrush - ZBrush is a digital sculpting and painting software solution.
MakeHuman - MakeHuman is a free, open source, interactive modeling tool for creating custom 3D human characters.
MODO - Modo by Foundry brings you the next generation of 3D modeling, texturing and rendering tools in a powerful integrated software package.
Unity - The multiplatform game creation tools for everyone.