Just gonna bring this thread back up
I voted Let Go (obviously, for those that know me).
Nostalgia combined with my relation with Avril makes me just LOVE Let Go.
Forever in the top 5 of 2000s for me.
Iconic album. I don't expect fans that didn't live through Avril's debut in music to consider this album their favorite, but for me, this one is unforgettable.
UMS in terms of quality IS better than LG (all those depressing and very angst-filled songs are always a joy to listen to) but LG had Complicated, Sk8ter Boi, IWY....and those songs are just too memorable to forget.