Improved Display

The Apple Watch Series 5 display, like the Series 4 last year, may seem like a small jump over the prior models — the case only grows by 2mm, after all — but the edge-to-edge screen adds more real estate on top of that, and when you’re dealing with a small screen to begin with, every little bit helps.
This is one of these things that has to be experienced to be appreciated, but we’re betting that for most users, once you go to the larger screen, there’s no way you’re going to want to go back.