meaning - "What about you?" versus "How about you?"

E.g.

• I'm going straight home after work. How about you?


• I'm going straight home after work. What about you?

They both seem to work interchangeably, but there feels like a subtle difference and I can't quite pin it down.

Similar but a little bit different from "How about" vs. "What about", the same arguments do not apply because we are always referring to "you".