I’m learning Angular (version 12), I understand the benefits of using lazy load by implementing loadChildren in nested paths. According angular doc. the way to implement loadChildren is by importing a module:

const routes: Routes = [


{
    path: 'customers',
    loadChildren: () => import('./customers/customers.module').then(m => m.CustomersModule)
  },
  {
    path: 'orders',
    loadChildren: () => import('./orders/orders.module').then(m => m.OrdersModule)
  }
];

It says as an example: “This creates a customers folder having the new lazy-loadable feature module CustomersModule defined in the customers.module.ts file”

In some other places like here, they import a Routing Module directly in the loadChildren declaration:

It says: “You must specify a routing module for loadChildren. This module must define the routes and should import all relevant ng modules”.

A Module is for importing components, pipes, provide services, etc. A Routing Module is focused for setting routes.

Besides of the sintax difference, when is better to use on over another?