Don't know what your office is like, but when I worked, I carried a mini-15 a lot of days. My office was in a warehouse, so that might be a bit different than your office. Both the mini-8 and mini-15 are minis by Emerson's standards, but they aren't as "mini-" as some brands do. The micro-Commander or mini-CQC-7 are more like most companies idea of "mini". I actually really liked my micro-Com. But my hands are too old and stiff to be able to manipulate or hang on to knives that small anymore.
I've had both the knives you're asking about. I kept the mini-15 because it's always been a favorite for the variety of everyday duties I have. It has a strong tip, a very slight recurve to enhance slicing but not enough to make sharpening difficult, and the handle is very comfortable to me. I think of it as sort of Emerson's answer to a BM Grip or Spyderco's Para 2.