Brands are mostly corporately owned, and sold frequently. So no loyalty there. There are products that have worked well for me, have been reliable, taste great or are unique to my needs and desires:
Acme Smoked Fish. I love everything that they make. Whitefish salad forever!
5.11 TDU's. I wear them every day.
Canon cameras. Been a Canon user since 1993, when Nikon was floundering in the autofocus arena.
HP laptops, since 1995
Asus motherboards, since my first build...?
NEC monitors, although I'm about to go Eizo
Tripp-Lite power products
Synology RAID NAS
Joyva halvah
Woodford Reserve
Stihl chainsaws, although my Dolmar/Makita felling saw is fantastic, too.
Dillon reloading presses
Dynalite strobes...RIP
VW
Mount Olive pickles and relish.