The Ruckus has less customizable options than the Deviant. Both are made from the same material, but the difference lies on how the bolt is made. The Ruckus bolt is made in one step, whereas the Deviant bolt takes about 11 steps to make.
That single step for the Ruckus bolt allows Defiance to maintain .001 tolerance, which allows the use of Pre-fit barrels.
I have been shooting for Defiance for almost 6-yrs.