intervew in Big 4

Hello, I got an on-site interview for a position in Professional Service of a big 4. I came from a small company ang went through the HR and technical phone interview. This is my final round. It seems the interviewers are director and manager. Generally speaking, what would they like to ask? the personality questions or more technical ones? What should I pay attention to?
To be low key or aggressive?

I appreciate your answers.