Performance: While the 100-200 dollar laptops are great for getting daily work done, they are not as powerful as mini PC of same range.So if you buy a mini PC for 200 dollars, it will pack more power than the laptop of same range. You will have smoother, better experience unless you have the budget to get the best desktop replacement laptop which have insane specifications.
Easy to repair: The mini PCs are generally more easy to repair than the laptops. All you need to do is unscrew few screws from bottom and you will immediately get access to everything including hard disk, memory, wireless card and whatnot. This way mini PCs are easier to maintain than laptops.