Bro please. I understand you can host very small stuff on less powerful Pis. I used to host some stuff on a Raspberry Pi model b myself. Stop tooting your own horn. You couldn't however host all the stuff I use or even most home labbers use on a Pi zero with modern software. I doubt it could run Jellyfin, an *arr stack, ollama, nextcloud, etc all at the same time. Probably you would also have to drop using containers which would be less secure and easy to deploy.
What's the performance per watt of a Pi Zero anyway? I am sure it's low power draw but I doubt it's actually efficient.
I mean sure. If you want to compare actual efficiency then performance per watt is the metric. Here a laptop would easily win as it has higher performance for similar power. The TDP of a U class processor is only 15W normally. It would obviously help to disable things like Turbo Boost as well. Said laptop having more performance wouldn't need to stay at high power states for as long as the Pi either as it takes less time to process requests. Returning back to idle faster is a big advantage.