Laravel 5 文件下载：stream() 或 download()

I have a Laravel 5.4 app where authenticated users need to be able to download private files from S3 storage. I've setup a route and controller to allow private file downloads.

代码如下所示:

路由:

路由::get('file/{filename}', 'FileController@download')->where(['filename' => '[A-Za-z0-9-._\/]+'])->name('file')->middleware('auth:employee');

Controller:

public function download($fileName)
{
    if (!$fileName || !Storage::exists($fileName)) {
        abort(404);
    }

    return response()->stream(function() use ($fileName) {
        $stream = Storage::readStream($fileName);
        fpassthru($stream);
        if (is_resource($stream)) {
            fclose($stream);
        }
    }, 200, [
        'Cache-Control'         => 'must-revalidate, post-check=0, pre-check=0',
        'Content-Type'          => Storage::mimeType($fileName),
        'Content-Length'        => Storage::size($fileName),
        'Content-Disposition'   => 'attachment; filename="' . basename($fileName) . '"',
        'Pragma'                => 'public',
    ]);
}

一切都很好，但当我仔细观察Laravel docs时，我发现他们只谈论response()->download().

如果我实现这种响应，我的代码将如下所示:

public function download($fileName)
{
    if (!$fileName || !Storage::exists($fileName)) {
        abort(404);
    }

    $file = Storage::get($fileName);

    return response()->download($file, $fileName, [
        'Content-Type'  => Storage::mimeType($fileName),
    ]);
}

Both functions can be found in the API docs.

My question: what would be the preferred way to go and what are the advantages/disadvantages of each?

From what I've gathered so far:

Stream:

• Does not require the whole file to be loaded into memory
• 适用于大文件

Download:

• 需要更少的代码