I not sure who is the best, how ever I do have some possibilites on who was the best.
A couple of possibilities:
Carl Agar, operated the first Commercial Helicopter in Canada. He founded Okanagan Helicopters in 1951. An Industry pinoneer, Okanagan Helicopters has since evolved into CHC.
The Soviet Helicopter Pilots at Chernobyl that : “From 27 April to 4 May, 5000 tons of sand and other material were dropped "down the throat" of the smouldering reactors before the fire was contained.”
http://www.ocnus.net/cgi-bin/exec/vi...e=92&num=23919