exports.prop vs module.exports for a constructor

1.js

// Boo
exports.Person = function( first, last ) {
  this.first = first;
  this.last  = last;
};


// In your app, you'd have to do
var Person = require( "person" ).Person, // woof.
    me     = new Person( "ralph", "holzmann" );

2.js

// Yay! \o/
module.exports = function( first, last ) {
  this.first = first;
  this.last  = last;
};

// Now you can simply do
var Person = require("person"), // omg, this is what I want
    me     = new Person( "ralph", "holzmann" );

3.js

// Best! \o/
var Person = function( first, last ) {
  this.first = first;
  this.last  = last;
};
module.exports = Person;

// Now you can simply do
var Person = require("person"), // omg, this is what I want
    me     = new Person( "ralph", "holzmann" );