A well-built gaming computer has better cooling flow (less heat soaking, longer uptime hours, better performance) a dedicated GPU (graphics card) hyper threading and anti-aliasing faster and cleaner compatibility, expandable rates, meaning space for overclocking with the addition of powerful cooling systems to manage it, having an SSD in a gaming computer is key for fast load times and faster tick rates. NUC computers have SSDs, which is good, but they have graphic chips instead of graphics cards which make the gaming experience much slower and will not give good fps in games. In general terms (many companies try to scam doing this) they add "gaming pc" to their computers and make people think they are fast and made for games, which in many cases is not true. You must have a powerful computer with a beefy graphics card to run moder triple A titles. Minecraft is an easy-to-run game for any PC nowadays, so if you are only going to use it for Minecraft, get a NUC (depends on which NUC pc you get though) Also, pre-built computers save money on many parts, one is ram. People think that if it has a high number of ram it will be good and fast, which is not true. You have to look for how many MHz it has and what DDR it is. I would suggest building your own PC, but for a first timer it could be tricky