Is it better to buy a custom gaming pc from a website(e.g cyberpowersystem/pcspecialist) or build it yourself(buy the parts e.g amazon)?

Update: thanks for all your answers, it's my first time building a gaming pc, however i do know what parts are compatible as some websites will notify you when you picking out your parts if something isn't compatible, has anyone used cyberpowersystem in UK or the US one, how good are they, are they reliable and do... show more thanks for all your answers, it's my first time building a gaming pc, however i do know what parts are compatible as some websites will notify you when you picking out your parts if something isn't compatible, has anyone used cyberpowersystem in UK or the US one, how good are they, are they reliable and do they have good reviews?
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