Review:

Both Series 4 models are slightly larger than their predecessors (more on that later), and their displays are more than 30 percent larger. That makes a huge difference. The 40mm model’s OLED screen is 394x324, compared to the 38mm Series 3’s 340x272 display, and the 44mm model’s is 448x368 versus the 390x312 panel in the 42mm Series 3. That’s right: The smaller Series 4’s display is bigger than the largest Series 3. This makes every interaction easier.