Saxophones: King (because of the Super 20), but Conn is a close second.
Technology: Samsung. It used to be LG since they have the best features imo, but I've just run into too many deal breaking issues with their stuff (apps crashing, phones boot-looping, phones crash-looping, the list goes on and on).
Cars: Chevy (not gonna lie, a big reason is the Corvette)
Motorcycles: Yamaha
Gaming: None, but it used to be Bethesda. Every game company I've seen just puts out nothing but crap nowadays.
Chocolate: Ghirardelli
Clothing: Under Armour makes some pretty comfortable clothes (we were given two shirts, a hoodie, and raingear in college marching band), they're just really expensive. I tend to wear whatever I can afford.