Golden Temple mail....because it is a good and punctual train...also I hate the garibrath because of congestion....duronto is better, even rajdhani but need to think twice about dynamic pricing...yuva expresss, no way, it must be discontinued or changed to a normal train. Add swaraj express too in this list as it travels till New Delhi, no hassle of alighting at Nizamuddin and travelling all way to New Delhi.