Question

The difference between point of view and choice of person in a story is that

Answer 1

third person POV is used when your narrator is not a character in the story. The third person uses the "he/she/it" narrator and it is the most commonly used POV in writing.

Answer 2

The point of view of the story is the perspective that the author adopts and is trying to portray through their work

But as for the choice of person as how they call it, it is how the characters may behave under different circumstances regardless of whether or not the author prefers that they go that way or approves of it

I mean the author may make the characters go against his/her personal preferences in order to prove later on that his/her perspectives were correct and the characters are proved wrong