More reliable at least than Cooper. Cooper always has fought lower-body injuries, so you never know when he's going to be slowed for a few games. I give him credit for playing through them but the times that he disappeared were mainly because of pulls, strains, fasciitis, etc. Those injuries have kept him from being an elite receiver IMO because he has good size, good speed and great route running. His hands are suspect at times, so that affects his play, but it's mainly the injuries.
Cooks has been remarkably healthy considering his size.