The DIB is heavier (60 lbs vs 46 lbs) than the Shredder or Paddle Cat. It is also a lot more expensive - it is listed at $2,750. The Shredders are about $1,700 and Hyside lists its paddle cat at $1,395. I don't know why the DIB costs so much more.
I've never paddled the DIB, I have paddled the Shredder and Jack's Plastic Welding's Culebra. The Shredder is the hands down winner in my opinion between those two. For me the big reason to get one of these boats is the super light weigh. You can hike it in, fly with it, and portage it with much greater ease than with any other raft. The extra 15 pounds for the DIB would give me pause. Hyside's mini-me is the same weight as the paddle cat and shredder (46 lbs), but the much shorter water line affects its stability in a negative manner, and I like to run class IV and V.
Shredders are made of neoprene. Hypalon is an additive to neoprene that is supposed to increase abrasion and UV resistance. Neoprene is more airtight than hypalon so some raft tubes are coated on the inside with neoprene and the outside is hypalon. I don't know of any advantages of vulcanized neoprene compared to other raft coatings. In my mind polyurethane is the best coating, followed by hypalon, neoprene and then PVC (mainly because PVC doesn't hold up well to being rolled up, but it is a lot cheaper).