branded or non-branded computers

It depends on the usage. If you want something you can modify/overclock with ease, then you can go for the generics. But in my experience, the branded PCs are better, they don't freeze or crash (unless you do something terrible to them)

unbranded is best because it is more customizable you can put whatever you want in it try to put high quality stuff and voila thing will work faster if you put the things matches with the frequencies of Hardware sometimes branded PCs Lacks Graphic Power I mean GPU and even they don't have slots in it too how frustrating.

Non-branded PCs are typically more upgradeable and are built with higher quality parts. Branded PCs carry a maximum of 1 year warranty unless you pay extra. The parts used in non-branded PCs carry a Minimum of 1 year warranty. Many parts have a 3 to 5 year warranty and memory usually carries a lifetime warranty. The only warranty benefit with a branded PC is that it all comes from one company so that's only one company to deal with if you have a problem.

i think it could be save if we choose branded computers because we can have guaranted from the manufactured and we can have after sales with good quality..

It really depends on how much research and money you want to put into it. I built my own machine and I love it. I didn't pay for anything I didn't want (such as a memory card reader or whatever) Also in many cases a computer may come with more of one thing and less or something else than you want. It helps to look around and also helps to know what parts went into the machine whether it is generic or not.