There are some products for which there are no suitable substitutes. I don't hold many strict brand loyalties [although I do have many preferences]. For the most part, I'll try anything.
There are, however, some items for which there I won't consider a substitute. I wouldn't occur to me to purchase a baking soda other than Arm & Hammer. There isn't an exfoliant out there that I like better than Fresh's Sugar Face Polish, and I've tried more than I care to count. I can't name an aluminum foil other than Reynolds Wrap. My razor is a Venus [although this one is subject to change, I was a dedicated Mach3 user for some time].
It's difficult when I become attached to a product and I can no longer find it easily.
That happened about a year and a half ago with Privé Formule aux Herbes melange #46: pommade du modelage. It was simply the best sculpting pomade for me. The fragrance was dreamy. The texture was perfect. It rinsed out easily.
Then, one very sad day the day after I'd scraped the very last of it out of the jar I discovered upon checking out at the salon that they had stopped carrying the line. I tried to be chipper about it, attempting to view it as an opportunity to try new products, and I immediately began searching for substitutes [I think I bought two right then at the salon]. One would think that there would be some product out there that would be similar enough for me to like it. Sadly, that was not the case. I tried about one a month since I ran out.
Today, on the way into the hair salon to get my hair cut into a sassy little pixie, I saw the Privé Formule aux Herbes wall display. On the third shelf was my beloved melange #46: pommade du modelage.
I am elated.