Shaan has been a wonderul anchor on the show. He has always been a sport and supportive of nervous candidates before they sing (Remember Joyita's last appearance with Salman as judge... that's when she said this for Shaan).
Being a singer himself, he understands the nuances of music and I am sure he has his favorites. This can be gauged by the subtle comments he passes after the singer completes.
I personally feel that he adores Hemachandra because he mentioned recently that when Hema sings, he makes it his own song and yet does not lose the beauty bestowed to the song by the original singer. That I feel is a praise of the highest order because this is an equally talented peer saying things about him.
Understanding the rules of the game, he urges people to vote based only on singing. He is just amazing. My pick for Shaan's favorite is Hemachandra among boys and Nihira among girls. This is my personal opinion purely.
Now, all you guys/gals can take shots at who is Shaan's favorite. If you can provide a specific description on why you feel that way that would be great.