I own both in RH. Both are excellent knives. The Commander is probably better if you're lonking for a pure fighter. It's also larger and more is exposed from the pocket, belt line. Interesting feature for opening from the pocket.
The Sebenza rules as an all purpose knife, and will certainly aquit itself as well as any "tactical" folder, if pressed into a defensive role.
I find the locking mech to be better on the Sebenza. YMMV
Lastly, I believe the Commander is a bit more troublesome for airport carry. I believe it will just make the legal limit for length, but you have to contend with "image" at these checkpoints...I've never had a problem with the Sebenza.
I second SD's comment if you want the in depth skinny:
www.bladeforums.com
Rich