Installing both on the same laptop without doing nothing more than the normal install, which one consumes less battery power at the end and makes the laptop last a little bit longer than the other, Lubuntu (LXDE) or Xubuntu (Xfce). Assuming that both will receive the same activities on the same laptops for the same amount of time.
Phoronix reported some Power and Memory comparison results for Gnome, LXDE (Lubuntu) & XFCE (Xubuntu).
The conclusions where that LXDE did comparatively better in reducing power consumption compared to both Gnome and XFCE.
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