Mines are Looking In >>>> Outside >>>> Languishing / Fourth Of July / Breakdown (can't choose the 3rd ). She gets so inspired and beautifully deep when she writes about personal shizzzz
Heartbreaker + Honey + Fantasy + Dreamlover + Emotions + Make It Happen + Always Be My Baby
And also Underneath the Stars, The Roof, Crybaby, I Still Believer, Stay the Night are her other best. And #Beautiful is probably one the best songs she's ever made tbh, sounds absolutely timeless.
Make It Happen (Daydream Tour and later arrangements)
Vision of Love (Daydream and Charmbracelet Tour arrangements)
Emotions (Daydream Tour arrangements)
As for albums:
Glitter >>>>>>>>>>>>>>>>>>>>>>>>>> Daydream >>>> Mariah Carey