Tricomin is more expensive than folligen pretty much because it is a "clean" copper peptide. By that I mean that it has been rid of impurities. Folligen on the other hand is as pure as you can get, and when you apply it in your scalp it will turn green until you wash it off.
The advantages of Tricomin is that it doesn't stain as much compared to Folligen, however, with folligen you can only apply it every other day at night and get results (at least this is what Dr. Pickard says).
Now, I have to say that I have been using folligen since February and have felt no difference whatsoever. Not sure if its just helping me maintain but still, I was hoping I could get some regrowth since I already take minoxidil and finasteride and it has been reported that it aids in regrowth if you're on the big 3.