This might be a bit of a stretch because it’s not a “brand” but…

Linux! I uninstalled windows almost 2 years ago to help me kick a bad gaming habit, and while I can appreciate the design of macOS and was a macOS user for YEARS before windows, I just can’t leave Linux now. Once I felt freedom it was impossible to convince myself to climb back into the ad filled box.

I stan no brand! I will always jump ship if they change the product in a worse way or something better comes along. I have no consumer loyalty whatsoever. It's more the opposite, some corporations I refuse to give money to because they are worse-than-regular-capitalism bad like have nazi owners or such.

I do have current favorites though like La Roche-Posay is making some killer peptide face cream that smells nice!

Most of this stuff is probably in creative tools/technology side. Nikon cameras, Asus computers, Wacom tablets, stuff like that. Because for these purposes I prefer to buy known-good tools that I'll be able to use for a decade or more.

Leolines! Expensive, but worth it if you're a trans gal looking for comfy panties.

Their bras are nice because they're proportioned for trans girls, but those might be easier to find elsewhere. I only own one bra atm (not a daily wear yet...)

I buy a lot of my clothes from Pact, esp. undies and bras - I like that most of their stuff is cotton and they are so eco-focused. Not sure it's strictly brand loyalty, but in practice I don't buy those things elsewhere.

King Arthur Flour. Better quality than store brand and employee owned.

My community is lucky to have a local grocery store, and it's a co-op, so I'm very loyal to it.

Otherwise, it's hard to be a loyal customers when so many brands change for the worse. I did get a "Hey, I use their soap!" moment after seeing Dr. Bronner's post about Pride and link to multiple pro-trans organizations they donate too, especially after so many brands have backed out this year. That was nice.

Bumblebee Tuna

Yoto

Caran d'Ache Pablo color pens. My mom got a big set of them when I was little and now I won't use any other coloring pens for my art.

Clover Amour crochet hooks! I've tried other brands because they looked great but nothing ever compared to the smoothness of the clover hooks!

Dairy milk! Fucking love it. It may not be as good as it was but it's still great

Zebra pens. The F-301 is the best pen ever made, ever ever. The pink barrel one is my favorite, because duh it’s pink. I like them so much that I have close to 30 extras just in case.

Not just this brand but this specific product and indeed this specific roast.

Sinloy was the first company in China to take coffee culture seriously, almost single-handedly creating the entire Yunnan coffee industry. They're primarily known for sourcing the local beans, obviously, but also do some importing of coffees from as far afield as Ethiopia and everywhere in between. Their quality control is very high, their roasters are top-notch, and yet their price remains very reasonable.

I buy 250g of this specific coffee (Yunnan "Red Wine" sun-dried SOE coffee) every two weeks and if I miss a purchase, that's a few days of suffering as I wait for them to roast and ship it. (They small-batch roast to demand.)

Hi-tec is the only brand I've found that makes quality vegan hiking boots at a good price. I'm on my third pair.

When it comes to make up, Mac and lancome