I don't really have that much stuff. But I guess I tend to stick with the same brand when I upgrade unless I had a bad experience.
Phone: Xiaomi (Android). Same as previous.
Desktop: Linux Mint. AMD GPUs and CPUs. Usually just look for deals, but I tend to favour Crucial for SSDs. G.Skill for RAM. Seagate for HDDs. Dell monitors.
Laptop:: Linux. HP Pavillion (but it's ancient and barely worth mentioning).
MicroPCs: I have two Zotac ZBoxes. I like the passively cooled ones. Unfortunately, both Intel (both have minor issues with Linux because of Intel).
Headphones: Sony
Speakers: Emotiva
I've never been an AMD fanboy, but I've generally bought AMD because they were usually the better price-performance buy whenever I purchased. Now that I switched to Linux, AMD is something I'll actually seek out.
I guess the one thing I am a fanboy on is Vivaldi. Use it on desktop, and on the smartphone. Use it for email (client and provider).