I got in a couple of N Anodes last week, and I honestly can't tell much of a difference in the feel of Proton and Neutron. They seem to flex the same, and the plastic seems the same except one is clear and the other isn't. Love the colors of Neutron though.
It may be in my head, but I couldn't putt with the Neutron as well as I could with my seasoned Proton Anode. I need to do more approaching and driving to determine if there is a difference for me there.