Hi,
Firstly I would like to say that masters in geology is a really good course and your future is really bright. Secondly speaking, University of Ranchi as well as fakir Mohan University, are both really good institutes and have established a reputation for themselves. They both have good faculty, infrastructure and other facilities. In the end it is mainly your choice what University you choose. Go through the external factors like fee structure cost of living etc and then determine which college you like and would take admission in.
All the best