Saying the 4G dongle gives you "unlimited range" is a bit optimistic. I use my drone almost exclusively in the back country, without cell signal. And yes, I agree that if you have to carry additional contraptions you might was well carry the RC pro.
In my case I will carry the S25U with me anyway, because I use it for my photography. The cell phone makes it much easier than a camera to see how a composition under weird angles works. I also find that I can see alternative compositions easier on a cell screen than looking though a viewfinder. Bottom line is the cell phone is with me at all times anyway. Under those conditions an RC N1 still seems like a good compromise.
In any case my new (to me)
M3P will be here Tuesday, I guess I will see how the RC Pro feels before making a decision. The RCN1 can now be had under $50 used so I will probably pick one up anyway.