The latest generation of iPhones are blazingly fast. The iPhone 8, iPhone 8 Plus and iPhone X all feature the A11 Bionic Fusion chip, which incorporates six processor cores, a Neural Engine, three-core GPU and M11 motion coprocessor. When it comes to speed, the A11 Bionic is 70 percent faster than the previous generation A10 chip, found on the iPhone 7 and iPhone 7 Plus. In fact, the A11 Bionic blows away the competition, too.
The iPhone X does not support the Apple Pencil. The Apple Pencil is only supported by Apple's "Pro" iPad models. This includes the 9.7-inch iPad Pro, 10.5-inch iPad Pro and both generations of the 12.9-inch iPad Pro.
There are plenty of third-party styluses that claim to work with all touch screen devices, including the iPhone. There are no Apple designed styluses for the iPhone X at this time.