I'm not sure I'd call the XPS 13 the best PC laptop. The keyboard is pretty terrible, and the touchpad is so wide that my palms will rest on it and cause the cursor to move around while I'm typing. There's also some bounce on the spacebar which results in sometimes registering double spaces (the latest BIOS alleviates the problem, but not completely).

The DPI of the screen is really high and doesn't scale well under XFCE, but I'm not sure if that's really a fault of the laptop.