I don't have the blades in front of me, but...
I recall when I first held the Scrapper, my thought was, "damn, this feels very light, almost flimsy." I am pretty sure the INFIcoot is heavier, probably owing to a longer blade and just more handle material. Within certain limits, I prefer slightly heavier to slightly lighter. I like the feeling that the INFIcoot just feels more substantial.
The mudder grip is ok, but it feels so soft/lush that it IMO does not feel like it is as tough as the INFIcoot handle. The handle on the Scrapper also appears to be two pieces which come together at the center of the spine, as opposed to the one-piece on the Inficoot. All Res-C might be created equal in terms of toughness, but when push comes to shove, my $ is on the solid INFIcoot handle versus any two-piece handle.
I also don't really care for the Scrapper rounded polished spine--I know, strictly subjective. I again prefer something with a little bit of edge.
Hope that helps.