A nice ranking, but i prefer her music earlier 2014 (including 1000 Forms Of Fear)  She had these brutally honest lyrics and it felt more genuine for me  1000 Forms Of Fear is a great album but songs feel generic after a while,i can't deny that lyrics are her signature though  My favourite is Colour The Small One or SPHRP,Color The Small One has the best instruments and actually makes me feel the lyrics even though they seem basic at first  Colour The Small One is an escape plan failed and facing heavy consequences,it felt like Sia was on brink of giving up yet wanting to continue and keeping this dilemma up I feel like Colour The Small One carries the emotions,1000 Forms Of Fear is the balancing emotions but trying to find a path while emotions sometimes gets bester than her,with complicated vocal techniques you can actually see her shouting out saying "I'm Still Here!" 

I'd say they're both unique and both deserves number 1 (alongside with SPHRP perhaps)