I had posted a response to Monte in a different thread before. If you notice, the Stahwille do no grab the "front" two corners of the fitting. Hazet does. To be safe, I would think as much contact as possible is best.
when you look at the pic's the stahlwille grabs 5 sides while the others only grab 4. i think the proto's we're the same as the stahlwille's