The Pixel phones are both made out of aluminum with a big glass window at the back, surrounding the camera, flash, and the fingerprint sensor (now dubbed Pixel Imprint). As for color, Google gives a choice between black or silver with an exclusive “really blue” option with Verizon in the US.
Google says the camera on the Pixel is the “best ever,” which is based on DxOMark testing. It also notes that the Pixel has the shortest capture time of any phone. The Pixel phones are shipping with Android Nougat which includes support for the Daydream virtual reality platform that was announced at Google I/O in the summer. You can long-press the home button to launch Assistant at any time. What is the difference between models, see here: for Pixel, the RAM is 4 GB, Storage: 32GB, 128GB, Display: 5-inch 1080p AMOLED, Camera: 12.3 MP, Battery: 2770mAh with fast charging; for Pixel XL, RAM is: 4GB, Storage: 32GB, 128GB, Display: 5.5-inch 1440p AMOLED, Camera: 12.3MP, Battery: 3450mAh with fast charging. Google will allow free unlimited storage for full-resolution images and videos shot with the Pixel.