It depends on your hardware. Windows managed to screw sleep mode in bios for certain vendors and laptop models, see my post here.
To me it’s non sense, if you got one of those, then yeah windows beats linux. My carbon X1 loses less than few percent overnight in sleep mode.
What hardware?
https://discovery.endeavouros.com/forum-log-tool-options/how-to-include-systemlogs-in-your-post/2021/03/
Edit: just saw post 10 months old 