Which Girls' Generation Member Is Daniel Radcliffe's Favourite?

During his appearance on ABC's LIVE! with Kelly, Daniel Radcliffe revealed that he owns one of Girls' Generation's albums.
He had received it as a gift from a Korean staff member during the premiere of the movie Woman In Black. He thanked the staff member on the show and expressed smiling brightly, "Even though I don't know K-Pop well, after seeing the album, I think I want to know more about it."
Later, he picked Girls' Generation's Tiffany as the prettiest of the girlband. However, after re-looking at the album cover, he said that Taeyeon is as pretty as Tiffany.