Collective
I feel a high hover (if you have the power) is safer in the long run, and all conditions. Provided you have the references for it.
No! You would be there all day/night..................and probably perish!!
ps - I have only four years experience in the Arctic in winter and many chaps here have much more experience than me. But I am still here! It would be nice to hear from 339 Squadron RNOAF who were our contemporaries at Bardufoss and who had been there, done that for many years................