I have heard people say that ATTI mode is more stable and better for filming. What do you guys think of that? Is gps mode ok for filming? What advantages does ATTI mode have? How do you use ATTI mode when filming?

Most modern consumer drones no longer have an ATTI mode that you can activate.

There is a way to do it through dji assistant. https://www.google.com/url?sa=t&source=web&rct=j&url=https://www.thedroneu.com/blog/atti-mode-mavic-2-pro-hack-zoom/&ved=2ahUKEwiMrrHPp8TuAhW8HDQIHeiRAgoQFjAOegQIGRAB&usg=AOvVaw2FH_4vUjiQwflMTWiKwbBx