I've used both. Mostly Nano shampoo. Prox-N didn't seem to do anything. Look in the success stories. Has anyone said "Wow! Look at 6 months on Nano or Prox-N!" No. A lot of guys use it as a kitchen sink approach, including myself.
Now, I know a lady that handle the Shampoo section for a huge supermarket chain, and the sales rep for Rogaine doesn't even use it. He has a shaved head-rogaines sheds were too much for him to handle! So just be careful what to expect. Consider this- guys like Jason Statham and Bruce Willis have a ton of dough, and while they are resigned to their hair loss, they'd probably like to have their hair back! If there was a hidden secret treatment, they be on it, no matter what the price!
I think some of these treatments coming down the line like latisse and the cloning will work, it just takes a long time. For all we know, some of these third world countries will beat us to it, such as Thailand, which is supposed to have some of the best cosmetic surgeons in the world, as they can pretty much experiment on all those poor trannies.