alt Hacker NewsThe Intel period of MacBooks allowed a more direct comparison. Don't think macOS itself is the differentiator vs Windows.
But vs Linux, well even Linux on a non-Apple laptop tends to mean screwed up power management. The display system might be less efficient too, depending whether it's X11 or Wayland, and idk which one is the good one.
A significant portion of the Apple Silicon efficiency gains would have come from shifting away from discrete GPUs. At that time it was very normal for the integrated GPU to be minimal (slow) because people who need it get a discrete GPU. Things are very different now because we push far more onto the GPU now vs. back then, which made Intel and AMD scale them up out of uselessness. Now most people don't really need a discrete GPU because the integrated ones are fast enough to even handle some gaming.