Recently i travelled in both the train 12649/ MYS-KCG SF. in my view both are good and neatly maintained. but i will rate MYS-KCG a little higher than SK because of early mrng arrival at KCG. speed wise both are the best and convenient to travel. coaches are super neat and neatly maintained till KCG.
overall the journey is good and best.
SK is good with limited halts. but arrival time to kcg is a pblm.