For me, I usually start with a main household that has an interesting backstory, as I play, and romance and/or friendships happen, I can add other households to my rotation. I like to have several households to play in rotation.
Here are some of the households and their backstories I have played:
https://www.ea.com/games/the-sims/the-sims-4/pc/gallery/97B92238C20C11E78F64BF8A633AFDC0
https://www.ea.com/games/the-sims/the-sims-4/pc/gallery/4AC0D8BED66511E886ABB573E4FD424D
https://www.ea.com/games/the-sims/the-sims-4/pc/gallery/98FEB60EC1AD11E78845A7B3994392A6
