Let’s start with why. Why would you want to build a computer?
Do you need a computer?
Are you a gamer?
Do you do lots of filming/editing?
Does saving money appeal to you?
Do you want to know more about technology and feel more prepared to fix something when it inevitably goes wrong?
If the answer to any of these questions is yes, then I strongly urge you to hear what I am about to say: Build it yourself!