hi Leon, ICNR is much better as the hot pixels will get subtracted evenly after one expo shot and will give a more accurate subtraction. With taking darks, you are averaging from eg: 10 x 6 minutes (1 hour) shots therefore tempreture will fluctuate during that 1 hour. I have to admit, i do darks rather than ICNR and have a collection of darks varying from different tempretures and exposures. Reason being is so i can spend more time taking other objects at night lol i know you are guilty of this also
