easy, Otterbox "the beast" Defender. Ultimate protection with cons.
Adds a tad of bulk and changes the iPhone's overall appearance.
Will have to use a Power Support Anti-Glare screen protector to get rid of the watermark. If you use say a Zagg forget it. It will have watermark galore. The babypowder trick doesn't really work. Just get the anti-glare.
Membrane scratches if wiped down. Its very easy to scratch it.
Will be difficult to unholster. When you put the iPhone in its locked in really good. It won't be falling out by accident (face in is the proper holstering). So when you need your iPhone you will have to figure out a "manual of arms" to get the iPhone unholstered. I have mastered it using two fingers but it took me a while. Or you can figure your own way out but one handed unholstering is tough.
I've been using this case full time now. Its working out really well. Its not a case for just anyone as some say its overkill or ugly or too heavy on the belt or too big, etc... but its been working out well for me. I tell ya, I've been stopped so many times at the mall and at work. Everyone thinks its a new model iPhone. Funny. Check out these vid reviews.