If you are doing a unreliable narrator, obviously first person.

If you are doing a sprawling epic family novel and struggling during the depression, most likely third person so you can switch between people and focus on their conversations and actions but then again it's more interesting from the point of view of the girl growing up... Or maybe third person and follow the girl when she's older and how that experience shaped her up until she's old enough to take care of her own grand children that are the same age of when the story started. You can convey her through her actions and the actions of her children who didn't experience the depression. You share the experience with her without her telling you it. Maybe she feels unappreciated. She didn't talk you into feeling it and that feels special since the narrator can convey the true reality and why she feels that way rather than her emotions complicating it if she said it herself.

I mean the point of view is like a device unless you are a writer that feels comfortable in a certain perspective.

Badlands, the Terrence Malick film... It's only an interesting film since you are viewing the boyfriend (the main character) in the eyes of a naive young woman. You kind of get caught up in the Romanticism of the very dangerous boyfriend. You don't even see it coming. It becomes horrifying. If it wasn't that way if would either wrongfully romanticizes a criminal... Or you would simply be following a criminal without liking him.