To each it's own I guess. I have been told by my hair system stylist that I have toppik visible on my temples. But then again, I used black and my hair color is dark brown so it could be due to that. One thing's for damn sure, toppik didn't do much to conceal my thinning hairline, all i remember is there used to be a lot of spillage and it used to be all over my shoulders and shirt.
Dermmatch makes my hair look fuller all around. Toppik could never do that. It was great for covering up bald spots, but it never gave volume to my hair.
I do have both fibers and dermmatch, still I use dermmatch for the temples because it looks more natural than fiber.