TABLET-FIRST VS. LAPTOP-FIRST
The Surface Pro 4, powered by the 6th generation Intel ‘Skylake' m3, Core i5, and Core i7 processors, is primarily a tablet-first device. But with a 12.3-inch, 2,736 x 1,824-pixel PixelSense display, up to 16GB RAM and 1TB SSD, Surface Pen support, and Windows 10 Pro, this powerful tablet is no mere content consumption device. Flip out the built-in kickstand, snap on a keyboard cover, and the Surface Pro 4 becomes a tablet that can replace your laptop.
On the other hand, the Surface Book is built like a laptop, with a screen at the top and a keyboard at the bottom. Equipped with a bigger 13.5-inch, 3,000 x 2,000-pixel PixelSense display, it also has a more comfortable keyboard than the Surface Pro 4 Type Cover. Like the tablet, it's powered by the 6th generation Intel Core i5 and Core i7 processors, supports up to 16GB RAM and 1TB SSD, works with the Surface Pen, and has an 8-megapixel rear camera with autofocus and a 5MP front-facing camera. The detachable screen is a bonus, for the few occasions you need to show the screen to other people quickly.
If the Surface Book is the ultimate laptop; then it’s no hyperbole to call the Surface Pro 4 the ultimate tablet.