Shoot in 4k and use warp stabilizer, always the best option :)
I had a shoot this weekend filming out of this heli http://instagram.com/p/cDWzhJS1MF/
We used a Tyler Mini Gyro but the flight was actually pretty smooth and I felt like I almost didn't need the Tyler.
We still used Warp Stabilizer on all the shots, because of air pockets and such. We punched into FullHD resolution which made the shots pretty soft. I wish we would have spend the money on shooting on a Scarlet in 4K !
I don't know how much experience you have, just a little tip: Always frame your shot so you are sure the blades are not in it. you won't be seeing the blades once you are up in mid air (you can see it on a wfm though). For Super35mm I recommend a 16-35mm lens.
Sorry if this is not an exact response to your question, I still hope in can helpful to you.
Good luck!