Note that if you get the spray, then you could apply it with a eyedropper the same way you would apply liquid Rogaine. The maker of Folligen, Dr. Pickart, wrote in reply to a customer that this is an acceptable way to apply his product, and it's what I do with Folligen. The problem here is that the liquid Folligen does not spread out nicely on the scalp the way liquid Rogaine does -- it kind of beads up like rain on a waxed car -- and since I don't know whether Folligen has any effect on the surface othen than that to which it is directly applied, there's a possibilty that I'm missing a lot a surface area by doing this. Obviously applying the spray as a spray would solve that, but for people in NW2 zone or lower without buzz cuts that means a lot of Folligen just landing uselessly in the hair.
Other than the recommendation to prefer the old American Crew formula over the new one, I can't really say anything for sure about Tricomin vs. Folligen, or even whether either of them works at all (I'm only 2 months or so into using Folligen). I don't think the testimonials are strongly in favor of one or the other. Tricomin at least has an internal human trial with some results; Folligen only has internal testing on mice. Same guy invented both.