At least when Kuu overperforms a song there's something new/interesting going on (Ai no uta at Kingdom Tour was a piano version, remix in a medley at TRICK Tour, the water stage in UNIVERSE Tour; Cutie Honey had a jazz ver on BC Tour, pole break on Kingdom Tour, during a medley in TRICK Tour and so on; maybe FREAKY is the exception but the song is so good I don't care hahaha). The problem with ayu is performing the same songs the same effing way
Namie sometimes varies choreo and sings some remixed version which is good but indeed she is the one who varies her set list the most, but then her concerts have the same looks lol I guess it's just to each their own