I've used both the regular Claw and the Claw Contour and my preference by far is the Contour. If you do a lot of walking it's a great sling for a duck gun. Most hunters are usually loaded with gear walking in and out of a hunt and the smaller pad is less bulky and more comfortable to use, whether you're traveling light, or humping a decoy bag/backpack/Camelback over waders/parka/jacket. It's more flexible and a bit lighter as well. You can un-sling and mount your shotgun in an instant.
One issue I've seen with the regular Claw was the center section of the tri-glide snapping off in cold weather. I've seen it happen twice, once on my shotgun while wading flooded timber with temps in the teens, the second time when they were adjusting their sling. Cabela's swapped mine out no questions asked.
Do you ever get the feeling you're being watched? Because if you do, I'll stop doing it.