Wohi to baat hai, for working class, RNC - NDLS, if JSK runs on time its best but I will take JSK even in winters too.
Options for SL class is JSJ and MURI exp which is supercrawler, so wont take it. Now 2 options JSJ and JSK, in winters both will run 8 - 10 hrs late, so it means JSJ will arrive ANVT around 2200hrs whereas JSK will reach in morning at around 0500 hrs or 0600 hrs. So I wud prefer JSK rather than being stranded at ANVT in chilly winter night.