All I know is Inventor cause that's all I've used for the past 2 seasons. Now I'm in the Project Lead the Way class at our school, and it's teaching inventor. I tried to use AutoCAD a few times... but it was too command based for me, I like to be able to click things and BAM it's done. I bet Inventor will eventually climb to that #2 most used spot... companies just have to figure out that it's really, really easy to use
