Even in the US there are a wide spectrum of Universities. Definitely doing a PhD in some Ivy league institutions and some well known Universities is better than doing it in the country because they have invested vast resources in their laboratories and also expertise. Within India also there are some good institutes such as IISER and few other Universities. If someone has done a PhD from IISER or any other good University, he/she can be comparable to the PhD in the US or anywhere else.

Prof. D. Narayana Rao
Pro Vice Chancellor, SRM University - AP