Chennai Nagpur if options are like duronto RAJ, TN, GT, Thirukural/TNSK, MDU CDG, Andaman/Gomtisagat, Sanghamitra, Ganga kaveri, Sharathasethu/Rameshwaram banaras, Rapti sagar and co and bagmati and co. then choices will be different. Problem with RAJ and Duronto is full day running but with extra run time TN will be preferred by people because its an ONT option. When run and skips alone are considered for chennai nagpur i feel duronto is best.