My Ranking:
1.Taeyeon
2.Seohyun
3.Jessica
4.Tiffany
5.Sunny
6.Yuri
7.Sooyoung
9.Hyoyeon
9.Yoona

My Favorite is Seohyun ! But I think Taeyeon is really the best in singing. Yoona is my 3rd Favorite But I think she's not that good in singing but she's more impressive in dancing.Hyoyeon is the best dancer but she has good voice but there are some members that are better than her and its beause I dont hear few lines of Hyoyeon becaused she's focused on her dancing.Sooyoung is one of the Lead Dancer,I dont hear enough lines for her singing But I there are stll unnies that are better than her.Yuri is one of Lead Dancer too She has a powerful voice too But I like more of her dancing.Sunny has the cutest voice but I think she's not that good singing live.Tiffany has a powerful voice, some sones think that Tiffany is one of the MAIN Vocalist but she's only a Lead Vocalist,The Main Vocalists are SeoHyun,Jessica and Taeyeon.Jessica the most recognizable voice ! One of the Main Vocalist but its not that powerful.Seohyun is my fav. One of the Main Vocalist,cute and powerful voice ! Taeyeon Most powerful voice ! Always singing high notes but she deserves it ! Well,that's just my opinion ! =))

1.Taeyeon(she has a powerful voice)
2.Jessica(she have a great voice too, but not so powerful like Taeyeon's)
3.Seohyun(she has a pretty powerful voice)
4.Tiffany(people say that she is a better singer than Seohyun, but not!Try to listen to Seohyun more!)
5.Sunny(She has a pretty voice)
6.Yuri(Sometimes she can sing great!)
7.Sooyoung(Not so good)
8.Hyoyeon/Yoona
9.Hyoyeon/Yoona (can't rank them)

just because some of them are considered main vocalists, it doesn't mean i have to agree. so this is my opinion, please respect it

1-taeyeon
2-tiffany
3-sooyoung
4-yuri
5-seohyun
6-jessica
7-hyoyeon
8-sunny
9-yoona

1taeyon (best ever voice)
2yuri
3tiffany
4sooyooung
5jessica
6hyoyeon
7seohyun
8sunny
9yoona

1.Taeyeon(powerful voice)
2.Jessica(awesome voice)
3.Seohyun(sweet powerful voice)
4.Tiffany(wonderful voice)
5.Sunny(sweet girly voice)
6.Yuri(pretty voice)
7.Sooyoung(yeah..)
8.Yoona(ummm...)
9.Hyoyeon(hmm....)

1.taeyon
2.yuri
3.seohyun
4.tiffany
5.sooyoung
6.jessica
7.sunny
8.hyoyoen
9.yoona

I agree with all of you guys....
YoonA can't sing better....
She just can Dance and act better...(^_^)

1. Jessica
2. Sunny
3. Taeyeon
4. Seohyun
5. Tiffany
6. Yuri
7. Sooyoung
8. Hyoyeon
9. YoonA

just really love Jessica's & Sunny's high & cute voice...
and don't like YoonA's voice...

1.Taeyeon
2.Jessica
3.Seohyun
4.Tiffany
5.Sunny
6.Yuri
7.yoona
8.Sooyoung
9.Hyoyeon
I think Sunny and Yoona improved...

I think...

1. Taeyeon
2. Sunny
3. Seohyun
4. Tiffany
5. Sooyoung
6. Yuri
7. Hyoyeon
8. Yoona
9. Jessica (everybody loves it but for me it's whiny and annoying, no offense)

1. Taeyeon
2. Yoona (cause i love her)
3. Hyoyeon
4. Tiffany
5. Seohyun
6. Sunny
7. Sooyoung
8. Yuri
9. Jessica ( i don't knoe just hate her so much)

this is my opinion no offense... :DDD

1.Taeyeon- powerful and stable when dancing, does tend to belt and wail alot

2.Jessica- melodious voice and stable while dancing, slightly quiet live

3.Seohyun- great deep voice, harmonizer and stable, breathy sounds are her problem

4.Sunny- powerful and has the widest range of tone, doesn't get her voice showcased because she isn't stable when dancing

5.Tiffany- great alto voice but has a limited tone and not the best live performer

6.Sooyoung- you can hear her sing, but has a limited range of tone and has a problem with pitch

7.Hyoyeon- YEAH I SAID IT. When I listen to her cover songs its stomps all over Yuri's. Hyoyeon is the dancer of the group so you won't get to hear her sing alot but many idols have said she has a great singing voice. Listen to "As Time Goes By" and you will see why she is better then Yuri.

8.Yuri- well she can sing but the problem is her pitch, breathing, and you can't always hear her when she is singing live

9. Its rare to actually hear Yoona sound good, not ok but good. However her voice just doesn't beat anybody hear.

i made some changes to my list

1-Taeyeon
2-Tiffany
3-Seohyun
4-Sooyoung
5-Yuri or Jessica. still need to decide on this one
6-Hyoyeon
7-Sunny
8-Yoona

hum, i'll just wait for their next comeback to decide Yuri's position. i know she's getting worse and worse but i'm confused right now =S

^PA, I guess well will never agree about Sunny position of lead vocalist, but come on you can't tell me she sings worse then Yuri

This is what i think:

1) Taeyeon -no doubt she has the best voice in SNSD. she can sing both low and high note pretty easily

2) Jessica - i used to hate her nasal voice but as time goes by, i kind of like it especially in song entitled 'Onye Year Later'

3) Seohyun - like Tiagih said, the problem with her is her breathing. other than that, she is perfect. she is the best harmonizer and she can replace Taeyeon on high note

4) Tiffany - well, she can't control her voice well. her live performance sounds really different compared to in album. BUT her voice is actually pretty good.

5) Sunny - especially in ballad song -oh if she dont tried to sounds cute

6) Sooyoung

7) Yuri

8) Yoona - i think yoona just have to be more confident in singing. that is how she can improve ^_^

9) Hyoyeon

My list (my Opinion)
1.Taeyeon (I think everybody will agree to this)

2.Jessica (she can sing as high as taeyeon but not powerful or loud as her but still the second best)

3.Seohyun (she can really sing high notes but when she sing high i can hear her breathing and it's kinda loud)

4.Tiffany (same problem i have with seohyun but at lest seohyun can sing and dance well at the same time)

5. Sunny (she doesn't sing well live and i don't like her voice when she sings low key, i think her voice is better with high notes)

6. Yuri (she can't sing well live but her voice is pretty good when she sings low key)

7.Soo Young (same problem i have with yuri but i just don't think she is a better singer than Yuri)

8.Hyoyeon (Even though she can't sing high notes at lest she can sing loud both in live or audio)

9. Yoona (i just don't think she is meant to be a singer and i can barely hear her when she sings live)

^^i agree

1. Taeyeon
2. Jessica
3. Tiffany
4. Seohyun
5. Sunny
6. Yuri
7. Sooyoung
8. Hyoyeon
9. Yoona
Just my opinion :)

1 taeyeon
2 seohyun
3 tiffany
4 jessica
5 sunny
6 yuri
7 yoona
8 hyoyeon
9 sooyoung

^Yoona over Sooyoung? Seohyun over Jessica? Tiffany over Jessica?

sorry its my opinion ilove yoona's voice more than sooyoung and so as seohyun over jessica and tiffany over jessica . yes jessica is the second main vocal in snsd but i found seohyun's voice more powerful than her and so is tiffany... just my opinion

^ that is nice but the question is who has the "best" voice not who you "like" the most. Yoona may sound nice but Sooyoung can sing better then her, in the case of Seohyun, I won't argue on that. Tiffany def is not better than Jessica in singing, because she struggles with consistency.

hmmmm best voice? well, alright :)

1. TaengSica (they are really great!! i really love when they sang high notes <3 i tied them both cause i both love their voices)

2. Sunny (i love her cute and girly high-pitched voice <3 when doing high notes, she sometimes sounds stable and sometimes not but overall she is still great)

3. Seohyun (kinda breathy and very her voice is mature when singing English songs (Sixteen going on Seventeen) but still rich)

4. Tiffany (her voice is husky and i love it but sometimes she feels left out when the other main vocals are singing high pitched songs or whatever you call it (Beautiful Restriction and Over the Rainbow)

5. SooRi (just like their voices xD)

6. Hyoyeon (sometimes goes out of tune when doing live)

7. Yoona (ehhhhh...)