India provides the most services from the above. The Chinese don't provide as many services but their revenue comes from manufacturing and business investments. India beats China in providing services to the US. China beats India by a large margin in providing manufacturing base and by selling its products to the US. Two different comparisons.
South Korea sells electronics and semi conductor based products and services to the US businesses. Pakistan, just like India, has similar potential too. Both countries have educated labor force with English as a part of the system due to British rule. Pakistan is way behind due to the environment (security, safety, business friendliness, terrorism, etc). In the next 10 years, Pakistan should show about a $ 100 billions in savings also, as the economy is growing and it'll grow much faster.