I believe the carbon fiber might be lighter. That's the main advantage it brings, if any. The Shaggy is noticeably heavier than the Super Scrappy, but I'm not sure how scrappy compares to Tdub. Hopefully you can try them all on, otherwise, ask Shred Ready. They're really good about getting back to people via email if you're a little patient.
I think Shred Ready is an excellent choice, if only for their superior (HOG) retention system. Check out this review
In independent safety tests helmet blowback is measured by attaching a hook to the front of the helmet, running it through a pulley and tying a weight to the other end (essentially). The weight is dropped from a prescribed height and the distance the helmet travels back is measured. Helmets using the HOG system rated 0 in blowback. End of discussion, you can't score better than that.
I don't work for 'em or anything, or even own a SR helmet yet, but ever since I tried one on, it's been high on my list. Needless to say, I'm a little jealous of anyone I see with these helmets on, even the $40 Sesh.