Duty (perfection)
(miss)understood (perfect genre-wise)
Party Queen (same as above)
but I would add LOVEppears too. I don't mind the lenght/some ballads in there. Also Secret and RnRC.
A Song for XX have too many ballads (all sound the same), I am have some songs I dislike, RAINBOW is too depressive (xD) MY STORY is too sad at once, GUILTY is tooooo massiveeeee, I like NEXT LEVEL but i dislike 2 or 3 songs on it, Love songs and LOVE again is a yawn-fest.
I don't include MINI's cause it would be unfair to judge, but tbh I can listen to Memorial address at once, also FIVE. I don't count LOVE and again as MINIS