"Hey Siri" support and possibly wireless charging case alongside AirPower charging mat.
Apple's iPad Pro vs. Google's Pixelbook
Priced starting at $999, the Pixelbook is more expensive than even the largest iPad Pro. Apple charges $649 for the entry-level 10.5-inch iPad Pro and $799 for the entry-level 12.9-inch iPad Pro.
For $999, the Pixelbook comes equipped with a 7th-generation Intel Core i5 processor, 8GB RAM, and a 128GB SSD, with all of the components upgradeable for a higher price tag. It has a 12.3-inch touchscreen display, putting it on par with Apple's larger iPad Pro, and it offers 10 hours of battery life.
The Pixelbook is just as portable as the iPad Pro, and it has the benefit of a 2-in-1 design with a 360-degree rotating hinge, which means it can be used as a traditional laptop or folded back for use as a tablet, complete with accompanying pen. As a laptop, the Pixelbook is on par with other ultraportable notebooks, but as a tablet, its keyboard is adding some extra thickness you won't see on the iPad Pro.
Though convertibility is a nice feature and wins out over the traditional tablet form factor, Google can't quite compete with Apple when it comes to software and performance due to issues with some unoptimized Android apps running on the Pixelbook. The iPad Pro's A10X Fusion chip is incredibly speedy, and optimizations like Metal 2 mean apps run super fast and super smooth on Apple's tablet.
The Pixelbook isn't slow by any means, and ChromeOS does offer increased security much like iOS, but the Pixelbook's high price tag, operating system limitations, and size are tough to swallow compared to the lower-priced and just-as-capable iPad Pro.