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For my own experiance buying complete computer set (Desktop) (chose good brand and chose suitable configuration) is better than assembling computer the performace for origional one is much better than assembling.
assembling Our Own Configuration
It's depend on requirement, Basically company looks both factor money and performance. I will go with A option because service and warranty most important factor during the system in trouble, because you get complete warranty with complete set.
if the cost not matter so please Buying a complete computer set (Desktop) because this is better performance without any interruption.
if money fact so Assembling your own computer set (piece by piece). because low budge better performance.
For me i want to buy for my own piece by piece so that i can choice the best brand and the good specification of each parts.
Build you own computer piece by piece is the best choice as you can choose exactly the right technology that suits your requirements.
The best option is gather parts of PC according to your computing needs and build it piece by piece.
it will help reduce cost and gain in performance according to your computing work.
I prefer assembling piece by piece (B).
this way I can choose all my options in terms of hardware and software requirements.
Buying in the store, the specification might be close but not exact