I am not sure about all of these. I do know that Autodesk is the company name. Autocad seems to be the industry standard right now. I also know that Revit is the up and coming program for architecture, so you may want to learn that. It is very easy to use, and it works in 3D (unlike autocad, which works in the X-Y plane). Many companies are moving over to that program. It is available free in demo form. I am including a link to the autodesk website. It has a breakdown of everything.

I hope this helps!