There really aren't many desktop computer "manufacturers" as most don't really manufacture anything..... Asus, Acer and MSI are exception that I can think of at the moment. What we have for the most part are "Computer System Assemblers" where they take components manufactured by others and assemble them together in a package. Kinda like making a salad..... different people made / grew the lettuce, tomato, onion, carrots, croutons etc, but someone else put them all in one bowl.
Laptops are a different story and there are only a few ODM's building laptops for name brand companies thatw e actually recognize. Clevo, Compal, Quanta, Inventec are the big 4 in this business. Quanta for example makes many of the Dell Latitude, Lenovo (IBM), and Sony Vaio laptops.
All of those ODM's and most PC Component manufacturers are in Asia, most of those in China. So as for getting the best, most durable product, I'd suggest reading the component reviews , assembling a list of parts and finding a local assembler or build it yourself.