Now this can be hard becuase of hte latest "Twinkle" song that came out but each person has something that makes them less "main" singer to me

Jessica- maybe because she sings in a higher registrar but her voice isn't powerful like Taeyeon, Tiffany, Sunny or Seohyun. Her sweet angelic voice sounds great but I wish there were more SNSD to bring out a new aggressive or powerful voice out of her.

Sunny- she can sing the highest note in the group but she really doesn't get a lot of singing time. Her OST are beautiful to listen to as well as her covers. Her voice is flexible from ballads to lots of "vibrations" in the throat but we can't appreciate her voice if she doesn't get a chance to shine.

Seohyun- I loved her in Twinkle and she shows she has a voice that can go high or low but her problem is when its all nine of them to shine not be someones backup vocalist.

Tiffany- she sings great on CD, but her live performance really needs some works but all in all not complaints, she has a confidence with her voice which shows when she sings

Taeyeon of course. She has a beautiful tone and puts emotion into her voice. Jessica has a nice voice in certain songs, other times it sounds nasally. But sometimes I think her voice is absolutely gorgeous. Seohyun has a nice voice with a good range but sometimes it seems like she has no passion for singing. And even though she has a great voice it can kind of fade into the background when she's with other people with more distinctive voices, even if they aren't as good. Tiffany's studio voice is gorgeous but she needs work for live singing. Sunny may have a cute voice but when she sings live there is no strength at all, her voice sounds weak and thin. So yeah, Taeyeon's the best.

always seohyun

taeyeon

not biased please

Sunny

taengoo ofc

Seohyun

Taeyeon