I will venture a guess and say that they individually get what ever works best for them. Kinda like asking: whats JTF2's favorite colour...
And it most possibly varies depending on what they do. Are you talking in the field? Or when they were doing close protection? Plain clothes?
I doubt you will find a definite answer.
Try different ones, when you find one you like, keep it. Untill them, re-sell them. I'm on my fourth right now.
Edit: if it satisfies your curiosity, you can see one @ 2:48:
http://www.youtube.com/watch?v=t6N-Rtv6Xg8&search=canadian%20commandos