"You can look at two very detailed comparison here and here.
Blender is the only free 3d application compared against the
heavyweight industry favorites like 3d max (which costs around
$5000+) and the only second application to support all three major
* Its free. Better than paying $5000 for a software.
* It rivals commercial software both in functions and features.
* Small installation footprint of 9mb. AutoCAD needs 2GB.
* Large community support with last version generating 800,000+
* Intuitive user interface.
* Python scripting API for game logic.
* Third party free plug-in, textures, renderers and scripts