I do both. When not sitting at my bench (which is not oft enough) I am behind my computer building architectural scenes.
I've been using acad since '85, 3ds and max since '90 and couple it with world builder and poser and you got yerself
hours of fun with no sun.
I get to do real fun animations and rendered stills (almost none of which I can post anywhere -:0))
3d modelling is an option
a true mental excercise in frusrtation