I think it would really depend on your helicopter, and who your passengers are. I know in the robbies that the blades would certainly not survive their contact with the water no matter which side you put them in, and that it is easier for the pilot to get out if you roll left. But if there is someone you care about in the left seat you'll probably want to roll right, as you likely have much more exp./familiarity with the helicopter. just my 2 cents.