My two last computers I have built myself. Not so much because pre-built systems wouldn't suffice, but I wanted something very quiet, and put in a custom water cooling loop with quiet fans. Another benefit from building a system yourself is that you can actually buy a large and expensive e.g. power supply (PSU) and re-use it the next time you build something new. But with a pre-built system you get a PSU that is barely sufficient to run your current rig. Next time you build something you need to get a newer and bigger PSU anyway, which makes the next upgrade expensive. Choosing parts for yourself, you can plan your upgrades years ahead.
And besides, building is fun! I like building stuff, and the DIY-approach to computers teach you about what a computer really are
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