We get asked many times "What's the difference between replica controllers and originals?"
Our replica controllers look nearly identical to the originals but they're made by a 3rd party company and not by Nintendo. They work fine if you're looking to just casually play some games but the originals are a bit better. They're a bit more accurate, more precise, the joystick usually works better and they're more durable and have a more quality feel when they're in your hand.
I generally recommend that if you're going to be playing quite a bit, are a more serious player, or especially if you grew up remembering how the originals performed you will be happier if you upgrade to original controllers.
For a more in-depth explanation, here's a video on the topic!