Nina. Why? Because she have hard job to do. I mean she's play Elena & Katherine...

I know Nina plays two characters but the only real difference is the wardrobe, her accent is exactly the same and so are her mannerisms!

Candice has been really strong on the acting front this season!

She can pull off both Kat and Elena <3

without a doubt, i mean you could tell the difference between katherine and elena even when they had straight hair :) she is amazing

My pick goes to:

Candice Accola
Katerina Graham

NINA DOBREV IS A ROCKSTAR.
Not only because she plays two characters but because it's like two different persons are playing Katherine and Elena. Nina is amazing.
Candice Accola is amazing too... so amazing that I have a girl-crush on her, currently. Love her!

and Candice.
But I also love Malese Jow and Kelly HU, they were very good actresses.
And Dobrev out of all TVD cast is the least good.

Without Dobrev there would be no TVD...she is the heart of the show :D

I think Nina and Candice are by far the superior actresses on the show. I think Kat is a very good actress too though, I just think her acting skills are weak sometimes.

i think they are all very talented!

NINA DOBREV OF COURSE!! SHE PLAYS 2 CHARACTERS SO PERFECT AND SO DIFFERENT WHICH IS GOOD!! NINA ALWAYS!!

i thought nina but lately her acting annoys me so damn much ...especially for elena , too much

^^ You can't blame Nina for Elena's attitude or stuff like these.

Nina's an amazing actress! Definetely the best actress on the show!No one can beat her.Candice comes second.

Merely as Katherine. She kicks ASS as Katherine, though. Candice is good too. Especially this season.

Candice is def better than bonnie, even my dad says so and hes a director of many plays lmao

Candy! I adore her and her acting has rocked this season, especially in episodes like 2x13. Saying that, Nina and Kat are awesome too♥