Windows has always offered (well, since Vista at least) some out-of-the-box customizable color schemes. MacOS has the ability to set a global accent color, but

Windows has always offered (well, since Vista at least) some out-of-the-box customizable color schemes. MacOS has the ability to set a global accent color, but it tends to surface in fewer places than Windows' similar option (some default Apple apps, that's it). MacOS (still, and has always) allowed moving the task bar to a different side of the monitor. Windows 10 allowed any of the four sides, MacOS allows all except top. Windows 11 is bottom-only. Earlier in the beta they also forced the application icons into the center of the taskbar (Mac-like), but they've since moved back on that and allow left-aligning them (Win10-like). They're both pretty light on global, out-of-box customization. If we're counting pennies here, I'd say Windows is still slightly more customizable, and if they re-added moving the taskbar to other sides of the screen, it'd definitely be more customizable.