found this when i'm browsing... hehehehee, just wanna share it tho'

A panel of experts was asked which SNSD members would have the most successful solo singing career.

Note: This in no way indicates which members the experts think WOULD go solo.

*edit* found a translation of the explanation part >.> 

Yoona: average score of 7.1
- Problem: She acted really well in 'Saebyuki' when she first came out, but hasn't shown much improvement. 

Taeyeon: average score of 7.0
- Problem: She sings well, but what else?

Sooyoung: average score of 6.5
- Problem: She's skinny and she's tall. But is there anything else?

Yuri: average score of 6.5
- Problem: She's awkward at everything she does [XD]

Tiffany: average score of 6.5
- Problem: She needs to improve her Korean which is lacking by 2%

Sunny; average score of 6.2
- Problem: As Lee Sooman's representative, she might get talked negatively about

Seohyun: average score of 6.1
- Problem: As a maknae, she seems imperfect

Jessica: average score of 5.8
- Problem: She looks too made up all the time, it's a risky concept

Hyoyeon: average score of 4.8
- Problem: You can't come on TV and just dance

*edit* 

that was basically actually a summary >.> here's the actual translation:

Yoona, as the center of SNSD, has the highest likelihood of success as a solo act. 6 out of the 12 professionals voted Yoona as the most likely to succeed. For her first drama, Yoona starred in 'You are My Destiny' in 2008 and gained a lot of popularity; after, she starred in 'Love Rain' and 'Prime Minister & I' but she wasn't particularly active and was not able to gain as much attention. The Director of IHQ Acting Academy suggested Yoona stop doing romantic comedies and take on a new kind of role. Yoona is highest for skills as an entertainer/variety as well because of her unique personality and the benefit of being Lee Seunggi's girlfriend.

Taeyeon is 2nd because the fans are most looking forward to her solo album out of all the other members. Voters said, "As a singer, her talent is outstanding."

Sooyoung's highest score was in the acting category. She "doesn't try to just act pretty, and she acts in a way that makes viewers immersed in her acting. She is like the Korean Cameron Diaz."

Yuri tied for 3rd place because "her strength is in her realistic and various expressions." However, they both need to foster their acting skills and individuality if they want to make it in the acting world.

In terms of variety, Tiffany got high scores because of her "soft appearance and ditzy blonde character" but "Because of her lacking Korean, it'll be hard for her to make it solo."

Sunny and Seohyun's average scores were 6.2 and 6.1 respectively. While Sunny got her highest mark in acting, the voters felt that she could be very successful as a supporting actress. As for Seohyun who has already participated in musicals and dramas, "If she gets rid of her maknae image, she could become a rising star."

Jessica who's participated in "Legally Blonde" got low marks in everything except musical, which put her at #8. "She was built up way too much in terms of acting and variety. She has a risky concept, and is in the verge of a disaster."

Hyoyeon was lowest on the list. While other members were busy promoting as an actress or as a musical star, Hyoyeon got #1 in a skiing competition. "Hyoyeon's extraordinary dancing skills and sense of choreography would make her a successful choreographer or planner within Sm Entertainment."