PropTypes.objectOf is used when describing an object whose properties are all the same type.

const objectOfProp = {
  latitude: 37.331706,
  longitude: -122.030783
}
// PropTypes.objectOf(PropTypes.number)

PropTypes.shape is used when describing an object whose keys are known ahead of time, and may represent different types.

const shapeProp = {
  name: 'Jane',
  age: 25
}
// PropTypes.shape({ name: PropTypes.string, age: PropTypes.number })