When comparing Sway vs Weston, the Slant community recommends Sway for most people. In the question“What are the best Wayland compositors?” Sway is ranked 1st while Weston is ranked 4th. The most important reason people chose Sway is:
Sway is designed as a Wayland port/replacement for the i3 window manager, and a lot of the config options for i3 work with Sway.
Specs
Ranked in these QuestionsQuestion Ranking
Pros
Pro Compatible with i3wm configs
Sway is designed as a Wayland port/replacement for the i3 window manager, and a lot of the config options for i3 work with Sway.
Pro Windows can be rearranged with the mouse
By holding down the modifier key, the mouse can be used to move and resize windows.
Pro Nice appearance
Has a good appearance with borders, buttons as expected of a stacking window manager.
Pro Headless Mode
Can run in headless mode (useful for tests & automation).
Pro Fast
Pro Absolutely very lightweight
Weston is the lightest Wayland compositor. It runs without lag even on old Core 2 Duo laptops, and the Weston animation also runs fluidly without problem.
Pro Simple
Pro Stable
Cons
Con Nearly impossible to manipulate windows programmatically.
Con Basic, less configurable and less compatible
Outside basic window management, no other fancy features. Outside adding launcher to the bar and changing bar colour, no other customisation is available. Also, it is less compatible with most Wayland applications since most are based on wlroots