which one is you vs which one are you

Some examples from the web:

• Now... which one is you?
• So, if you can remember which one is which, then you have a better memory than I do.
• I wonder which one of you is lying.
• Yes, I know which one is more important to you, but...
• So, which one of you is the vice principal, and which one of you is the...
• Which one of you is Michelle Huddleston?
• - Which one of you is the leader?
• You should have a competition to see which one of you is the most annoying.
• Okay, regardless of which one of you is right, We need to get to him before the FBI does.
• Which one of you is Allan Dallis?
• Which one of you is Yuki Hakutani?
• Which one of you is Mirdin Askari?
• Which one of you is Eldon Stammets?
• Which one of you is Michael Collins?
• Which one of you is Frances?
• Don't make me tell you which one of you is going to go bald before 30.
• Which one of you is Joyce Scroggs?
• Which one of you is Ronald Fleury?
• She wants to know which one of you is stronger.
• Which one of you is Narumi Taiga?

Some examples from the web:

• Your voice sounds familiar, which one are you?
• Like, Which one are you? Remind me.
• So which one are you feeling about your parents?
• You got to ask yourself which one are you?
• So which one are you going to do?
• So, Adam... which one are you sleeping with?
• So which one are you, BoJack?
• So which one are you, Mr. Gibson?
• Button's, which one are you trying to 'save him for?
• Be honest, which one are you looking forward to the most,
• Speaking of, which one are you going to join?
• Thank you. N-Now, which one are you?
• There's a cream cake and a bean cake, which one are you having?
• Which one are you looking at exactly?
• Which one are you more angry about?
• Which one are you, Dr. Oswald?
• Which one are you jealous of?
• Which one are you more comfortable being?
• Which one are you referring to?
• Which one are you, Gibbs?