As far as favorite is concerned I guess it would have to be Asus, they cover so many fields these days however, compared to when I first started building PCs and they primarily made motherboards, of which I've had 4 currently only still own one of them, the other three to my knowledge still work and this is going back over a decade. I've never felt badly recommending any of Asus' products, truly a class leader in the industry.
A very close second would easily be Corsair, they make some of the best PSUs I have ever owned, I have yet to have one die and the oldest being a first gen TX750 that has been used 24/7 for the better part of the last 5 years of the nearly 10 years I have had it, previously it was my main builds power supply, I replaced it with a HX850 and I have another HX650 in another build, none of which have ever skipped a beat, I've also had RAM from Corsair and a headset that I still find to be one of the most comfortable ever made.
I have to give a shout out to EVGA, they may be primarily focused on marketing, especially for their motherbaords, but my x58 SLI rev 1.0 had been nothing short of astonishing, it held an overclock on my original 920 for almost 3 years, then on my 960 for another 3, it may have had weird issues with power on from standby (it never did this properly) and could only boot from a cold power off when overclocked but to this day it works, not bad for a motherboard that came out in 2008.
Hard drives is a no competition category, Western has been my go to source for years and out of all my drives I've had one 640 Black die and was replaced under warranty with a 1TB and only recently has my first 500GB unit died completely which is well past warranty. Also had a couple 2TB greens go sour, but still work, just real slow so they're as good as dead at this point.
To be honest I've had a tremendous track record with components, and by no means should my favorites represent the best in the industry, some people get really unfortunate with their purchases and can sometimes reflect badly on otherwise great manufacturers. But at the same time really bad manufacturers keep on making garbage year after year ane people get drawn to it somehow and then try to pass it off as top quality, while some do eventually get better with time. This is a subjective question that no one should take as solid advice towards the purchase of their next system, it's always best to do some real research to determine what suits your needs best while also upholding a good reputation and most importantly a good warranty policy.