HP PAVILION X2
It was hard to pick a winner, considering that all three devices performed quite comparably in benchmarks, but the HP Pavilion x2 tipped our scales for the simple reason that it is more well rounded and makes the most of what it has. HP did a good job of masking the fact that the x2 doesn't have an aluminum chassis by painting it in fun colors. It is also the only device that manages to cram not just a full-sized USB port, but also a forward-looking USB Type-C port into the tablet display without compromising too much on portability and thickness. Our only gripe is its erratic track pad, but given that all three devices have somewhat narrow and small track pads (they are convertible notebooks after all), you're better off using the touchscreen anyway.