[10west]

Do both, but remeber, after learning a few "hand drawn" grapics basics, for depth and lineweight, texturing, etc, you can just plop a tissue over a plot from cad, or oblique and perspective, and just trace the forms for design iterations.
The other thing is, AutoCAD is getting alot more powerful, for using images from hand drawn or sampled sources, and you can always scan a sketch, scale it simply, and use it for presentation bases, and cost estimation querying in AutoCAD, or just to layout in a source for easy digital output.

Autodesk Architectural Desktop, has a command known as Napkin which will create a vector overlay, that looks like a loose architect, or landscape designer did the line work, and it is very reliable, and very quick, but as far as I know, it's only available in ADT.
HP and others may still make aplot driver, which, in a twist of effect, applies a handdrawn look to the plot outpit. When I sae this, in AutoCAD 14, I knew at that time it was the best, and I think still may be, but I could not find it in later release supports for acad, from hp, but theymay be there.
There is also a sketch.lsp routine, which in a few forms on the internet, such as at cadopolis.com, or other searches, provides a line variation, you can adjust from the command line.
AutoCAD, also has, in tangent with the SKPOLY system variable, a command called SKETCH, which allows you to trace, on screen, which may be nice, with a tablet and pen, rather than the mouse.
Maybe late, but it still applies, to someones knowledge.