Question about Apple Pencil for iPad 10

I recently got iPad 10 for Christmas. I’m very happy. Also I received a cheap knock off of the Apple Pencil. Which for me is fine, but I’m wondering if I’m missing some features or the Apple pen is actually better ..I think it was on Amazon for like 20 bucks. ✏️ so my question is what’s the difference between the USB-C Apple Pencil and knock knock off from Amazon??