Form and rules
How it works
Used to can describe both repeated past actions and past states: We used to visit; I used to own a car.
Would can describe repeated past actions when the past time frame is already clear.
Would is generally not used for past states such as know, believe, own, live or be in this habit meaning.
Narratives often introduce the past context first, then use would for repeated actions.
Would for past habit is different from conditional would and from polite/request uses.