also, hello better graphics #pcmrReasons to get a PS4: basically a all in one pc meant for gaming and requires no upgrades.
Reasons to upgrade or build a new pc: ability to customize your case, a ability to go way over board with how much ram you want, GPU's don't need to be upgraded as long as it runs the games you want to play, ability to over clock that CPU and gpu, most pcs can run whatever OS you throw at it, supports multiple hdd/sdd/pcie based ssd, can run multiple graphics cards, piracy and emulation are easily to access.
Clearly pc is superior in most cases. But PS4 is optimized for gaming uses. Pc is basically a game station/work station all in one