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It’ll depend on how efficient your phone charger is vs your PC PSU. Looking at some charts, it’s a very close battle but generally the phone charger seems to win out. Probably because it’s more optimized for its max power output, whereas the PSU needs to support a wider range of loads.
https://silentpcreview.com/power-lost-a-better-way-to-compare-psu-efficiency/
Kinda depends on where you live but there often is an excess of hydro and wind power overnight.