Inline function expressions vs function declarations

1.js

function getOrderDetails(orderID,cb) {
  db.find( "orders", orderID, function(err,order){
    if (!err) {
      db.find(
        "customers",
        order.customerID,
        function(err,customer){
          if (!err) {
            order.customer = customer;
            cb( null, order );
          }
          else cb(err);
        }
      );
    }
    else cb(err);
  });
}

getOrderDetails( 1234, function(err,order){
  if (!err) {
    displayOrder(order);
  }
  else showError(err);
});

2.js

getOrderDetails( 1234, onOrderDetails );

// *************

function getOrderDetails(orderID,cb) {
  db.find( "orders", orderID, onOrder );
  
  // *************
  
  function onOrder(err,order) {
    if (!err) {
      db.find( "customers", order.customerID, onCustomer );
    }
    else cb(err);
    
    // *************
    
    function onCustomer(err,customer){
      if (!err) {
        order.customer = customer;
        cb( null, order );
      }
      else cb(err);
    }
  }
}

function onOrderDetails(err,order){
  if (!err) {
    displayOrder(order);
  }
  else showError(err);
}