Collier is more of a Clowney type, stout defensive end that controls the LOS on run downs and makes things uneasy for the QB on passing down. Robinson is more of a pure rush end that you unleash on third down. Different players so it's hard to draw a comparison.
As it stands, the only teams that worry me are in the AFC. Pittsburgh and Kansas City. Nobody in the NFC has impressed me other than us. Tampa looked rough against New York and Chicago, and Vegas for three quarters. Green Bay got worked by the Vikings last week and Brees doesn't have an arm...