Active Record vs Unit of Work

gistfile1.js

// Active Record
var User = Model.define( { 
   id: "UserID",
   transport: {
      create: "create.php"
   }
});

var user = new User();
user.set($("form").serialize());
user.save();

// Unit of work
var User = Model.define( { 
   id: "UserID",
});

var dataSource = new DataSource( {
   model: User,
   transport: {
      create: "create.php"
   }
});


var user = new User();
user.set($("form").serialize());

dataSource.add(user);
dataSource.sync();