Depends on the component or device but I do tend to go for big-name brands. Not because their devices always perform better or last longer but big-name brands do, on average, test their components better, IMHO. Maybe only because the cogs of big-name corporate turn extra slowly, allowing for a longer QA. 😆
TVs - Samsung. I am currently still rocking an ancient (by electronics age standards) 1080p 50" Samsung plasma TV. It has been perfect for the past 11 years and I don't really see a need to upgrade. I've got a Fire TV hooked up to it for all my Sling TV, Disney+, Netflix, and Hulu watching needs (cut the cord several years ago). When the lion's share of my favorite content is getting produced in 4k+ (not just upscaled) I'll probably upgrade but not before then.
Monitors - Big-name. Late last year I upgraded to a Samsung 1440p 144Hz curved gaming monitor but I've used several name brands prior with no major issues.
Laptops - Big-name. Lenovo, Dell, HP, Microsoft, and Apple are my go-to depending on needs. Some of the Asus, MSI, Toshiba, and Samsung laptops I've worked with in the past were fine too.
Cell phones - iPhone. For the past 10+ years I've been bouncing back and forth between the Android and Apple platforms. Last year I picked up the Samsung S10e (256GB) and immediately found myself wanting my iPhone back. I went back to the iPhone 11 Pro 2 months ago.
Headphones - No preference. I was using Audio Technica ATH-AD900 cans up until a couple years ago. More recently I've given some of the lesser known companies a go. Currently using V-Moda Crossfade II wireless codec edition (pretty damn good).
Speakers - No preference. There are so many good brands. Currently using the Creative T4 wireless because it works with everything I have, including standard RCA from my preamp (vintage turntable).
Corp networking equip - Cisco Meraki. I love the simplistic configuration. I really dislike the old Cisco iOS CLIs.
Home networking equip - Netgear. I just named the one I'm currently using. I've had issues with it and just about every other home router/wireless I've used though. Usually because I'm try to get it to do too much.
Security camera - Arlo. I picked up the Arlo Q a few years back on a black Friday sale. I really like the free (limited) cloud storage for the life of the device.
CPU - No preference. I've gone back and forth between Intel and AMD for the past 20+ years and don't think I'll be stopping anytime soon.
Memory - Big-name. Corsair, Micron (Crucial), Hynix, Kingston, G.Skill. I usually don't buy anything outside these (if buying for myself, friends, or family). 😉
Drives - Big-name. Western Digital, Samsung, Toshiba, Seagate.
Video cards - Big-name. I've had very good experience with many different manufacturers.
Motherboard - Big-name. Gigabyte, MSI, ASUS.
Power supply - Big-name. Currently on a Corsair RM750x.