Sequential vs Parallel Service Requests

Sequential

public async Task<HttpResponseMessage> DownloadWithHttpClient()
{
    var httpClient = new HttpClient();
    var request = new HttpRequestMessage(HttpMethod.Get, "http://stevenhollidge.com/sample.json?" + DateTime.Now.Ticks);
    var response = await httpClient.SendAsync(request);
    return response;
}

private async void HttpClientGoButton_OnClick(object sender, RoutedEventArgs e)
{
    for (int i = 0; i < 9; i++)
    {
        await DownloadWithHttpClient();
    }
}

Parallel

public async Task<HttpResponseMessage> DownloadWithHttpClient()
{
    var httpClient = new HttpClient();
    var request = new HttpRequestMessage(HttpMethod.Get, "http://stevenhollidge.com/sample.json?" + DateTime.Now.Ticks);
    var response = await httpClient.SendAsync(request);
    return response;
}

private async void HttpClientGoButton_OnClick(object sender, RoutedEventArgs e)
{
    for (int i = 0; i < 9; i++)
    {
        DownloadWithHttpClient();
    }
}