I have the commuter, its actually really good! I liked it. The screen protector is really easy to put it on, they have a step to step instruction how u can apply the protector. I prefer the commuter over the defender, its just way more slim, its looks a lot better without giving away too much protection .
Well, however, if u want extra protection and not too fuzzy about the style of ur phone, u should go with the defender, even though it looks a bit rough and thick. But sure get the job done, plus I believe it comes with a removable holster, very professional looking gear on ur belt.
So over all, if everyday use, get the commuter, if its for biz, or tough working environment, defender.