Either the AM or the FM radio should have more range than your eyesight will allow you to see what the model is doing. For all practical purposes... that means you have no useful range difference.

Dependingon what the aircraft is that you are sticking them in... the 3003's can work. They have worked for controlling .40 size trainers to .60 size sport models for several years. don't stick them in glow power helis though...[&:]

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I just thoght of something though... Isn't the 4VF an FM radi? Futaba model designations ending in F are normally FM.