And the winner is.............
I actually purchased all 4 of the cases. Here is my opinion on each:
Number 1 overall - Otterbox Commuter.
I have used Commuters in the past on my iPad and my Android smartphone. It appears that the fit and finish on the new Commuter for the 4s is poorly designed from a fit and finish standpoint. Things just don't line up very well. Exposed edges. But it's a case and it protects the iPhone the best of the 4.
Best of the rest - Incipio NGP. It feels solid, well designed, not flimsy. Edges are firm and solid. Not tacky, slips into and out of pocket easily, overall very well done. It's the one on my phone now.
Third place - Speck Candyshell. It's a nice case, but too glossy, scratches too easy. Feels bulky. And the rubber edge is starting to flake off. It seems to have good phone protection but little else.
Last place - Speck Pixelskin HD. Very poor. Very flimsy, especially the charging end of the phone. The case is too thin, therefore the edge right below the home button moves easily, affording very little protection in that area.
I'll keep the NGP on and rotate that with the Commuter. The other 2 I may use once in awhile but not often.
Keep in mind, these are my opinions. YMMV
Len