'How about you' is often used in situations where the speaker is expressing a preference or making a suggestion, and wants to know if the other person shares their opinion. It can also be used to express empathy or solidarity, and to show that the speaker is interested in the other person's feelings or experiences. For example:
A : I'm feeling really stressed out today.
B : Yeah, me too. It's been a tough week.
'What about you' is often used in situations where the speaker wants to know if the other person has any additional information or thoughts on a particular topic. It can be used to prompt discussion, gather information, or encourage participation. For example:
A : I loved the movie.
B : I think the directing was great.
