My favorites are the Kagamine's.
Rin and Len have such pretty voices, and it's amazing how no matter what sort of song it's supposed to be (wether it's happy or sad, or angry) they can always ALWAYS get that emotion into their voices! It's amazing!
Miku however...is my least favorite. Given some of her songs are good. But her voice just gets so....blah. She almost never has emotion in her voice. And she's so overrated it's CRAZY. She's good but can never reach that point where it just makes me cry it's so good. Rin and Len have made me bust into tears many a time.
Especially the Evil saga. Ugh. Cried like a baby during Servant of Evil and Message of Regret. Prisoner and Paper Plane as well. And Kokoro. And Proof of Life, and Soundless Voice. UGH.
Love, love, love, LOVE the Kagamine's.
MIDORI WA TEKI DA!
(Green is the enemy)