Check the CPU, every NUC has a different one. An 11th gen i3 (i3-1115G4) will generally offer better performance than a N100 but a N100 may offer slightly better power efficiency since it was designed for it and is newer. Also when keeping in mind power draw and thermal efficiency, newer CPUs will usually do better. I personally would stear clear of older machines for that reason.
Whats a wallpaper? I thought we were supposed to use linux CLI only.