What is the correct way to attach a controller method to a specific route? code example

Example 1: laravel route controller

use App\Http\Controllers\UserController;

Route::get('user/{id}', [UserController::class, 'show']);

Example 2: laravel 8 routes namespace

Route::group(['namespace' => 'App\Http\Controllers', 'prefix' => 'admin',
 'as' => 'admin.', 'middleware' => ['auth:sanctum', 'verified']], function()
{
    Route::get('/dashboard', ['DashboardController', 'index']);
});