Rajdhani. If I am paying extra, I have to ensure that I compulsorily get what I am paying for. Things like punctuality, proper service, cleanliness are somethings that I need and in those fields, Rajdhani Express shines. Duronto is good but for some trains(like HWH Duronto and SDAH Duronto), punchuality is a major issue. I would not like to spend more money and in the end, reach somewhere 4-5 hours late. Hence, Rajdhani