The premise of both designs is the same: cover as much of the iPod as possible in highly resilient, hard aluminum, and either leave the rest exposed, or use some type of plastic as a play-through shield. As a customer, you have several choices: do you want a silver or black case? Go to either company. A case that?s specifically tailored to fit either the 80GB or 160GB iPod? A detachable plastic belt clip and lanyard necklace? Again, go to either?