We make both, and the two pieces get bought for the same occasions: a wedding night, a first date, the day someone said yes. On the surface they do the same job. They freeze one moment in time. But they tell that story in opposite directions, and the right pick depends on what the moment was actually about.
A star map looks up. A city map looks down.
A custom star map shows the exact arrangement of stars over a specific place on a specific night. It is quiet and a little romantic. It works best when the date matters more than the location, because the sky is abstract enough that nobody reads it as a literal pin on a map.
A city map does the opposite. It zooms into streets, a coastline, the bend of a river. It says here, this exact corner. It is the better choice when the place is the story: the neighborhood you lived in when you met, the town where you got married, the city you moved to together.
Match the map to the kind of memory
If your milestone is emotional and the where is fuzzy, go with the stars. A couple who did long distance, or who count their anniversary from a video call, often connect more with a sky than a street grid that does not really represent them.
If your milestone is tied to a real, walkable place, the city map wins. People who can point at the screen and say that is our street tend to love it more over time. It rewards a specific address.
They read differently on a wall
There is a design difference too. A star map is mostly dark with fine points of light, so it reads as calm and recedes into a room. A city map is busy with lines, so it carries more visual weight and pulls the eye. In a small room or a quiet bedroom, the star map sits better. On a feature wall or in an entryway where you want something to talk about, the city map earns its space.
What to do if you cannot choose
Some couples have two dates that matter: the night and the place. In that case the cleanest answer is one of each, hung as a pair, rather than trying to force both ideas into a single piece. A crowded design that does everything usually does nothing well.
If it is a gift and you are guessing on their behalf, lean toward the star map. It asks less of you. You need a date and a city, not the precise street, and it is harder to get wrong. A city map centered on the wrong block is a small heartbreak. A sky is forgiving.