Search engine optimization services

I plan on using my site. I asked my outsource SEO in India. Someone told me that SEO companies in India are very professional and technologically advanced. And they are not as responsible for a bomb. They are in the U.S. and my service on the local market. I hope that the SEO firm in India and understand the needs of the U.S. population. It would be a good idea to leave them? Can anyone tell me about the service the most famous in India? I want to your advices. I'm excited cannot wait to hear from you.