I guess I've already said my bit, although I never flew the J. I had quite a few sorties in the F.
Fonthill Media - The Phantom in Focus Sampler
The F4K was really only good for the carrier as the lack of avionics was a serious limitation.
The F4M was good down low. The radar was always good but (eventually) reliable. The J79 was a jet so worked better at height. The M probably went quite a bit further in terms of range, certainly when I worked with the J79 jets.
Have to say that most of my mates that flew the J preferred it to the M.