For me there's two obvious improvements:

- Support for multiple monitors with different scale factors, eg. a high-DPI internal laptop screen and a low-DPI external screen. Dragging windows between each display is seamless with Wayland, which is better than you can even say for Windows.

- Touchpad scrolling in web browsers is now smooth tear-free 60fps+. For some reason, both Firefox and Chromium-based browsers had frame pacing issues with Xorg, especially on low-powered hardware or with full desktop composition. These issues were so well known that testufo.com refuses to give results on Linux browsers. But both browsers work about as well with Wayland as they do in macOS and Windows.