This one is a bit tricky when it comes to finding a winner. The new Gear S2 3G has a AMOLED display of 1.2-inches and a 360 x 360 resolution. The Gear S has a display of 360 x 480 pixels and is two inches. The display on the older device, however, is not circular, which is a preference for many users.
Really the display on the Gear S is better in terms of pixel density, however those who prefer a circular display are likely willing to forgive this, especially on a display so small that the slightly smaller number of pixels might not even be visible.