I put carbon steel as it is only a TEST SURVEY and I have no real preference.
Carbon steel is probably my least preferred as I don't think I have any that I use now. Heat treating is difficult when one is not good with colours.
‘Horses for courses’, I reckon. And not much choice for end mills, if those happen to be your most used cutter ( if you mill on the lathe)!
So the survey, if a real one, would need some better constraints added to be properly meaningful so that the results are dependable.