Hello everyone,
I used to work on Arch Desktop 2004,  but my new company use Auto Cad. I'd like to introduce my new firm w/ advantages by using desktop but there are so many changes since 2004.  Does anyone know what is better than plain autocad , and good enough w/ Viz Render? Thanks a lot.

You have to draw lines and arcs and boxes in AutoCAD while you can draw walls, stairs and windows in AutoCAD Architecture.
There are lots of AEC functions which will make you more productive - walls (+cleanup), stairs, windows, schedules, dimensioning, project management, keynotes, display configurations...