I looked to more reviews to break see if there was consensus. So far, AMD seems to win comfortably on battery and efficiency for most reviews I’ve seen.

Two of these additional sources would be Notebookcheck and Jost Josh.

EDIT: this explains why Ars’ review isn’t in alignment with the consensus: https://old.reddit.com/r/framework/comments/16ytxjd/saved_you_a_click_16x_better_battery_life_if_you/k3ar79v/?context=3