O.K, again, talking from my experience. I have never seen let alone worked on a Rotorway Exec so that puts me at a little disadvantage. (O.K, a rather big disadvantage!)
From an accident point of view, the Rotorway's that I have seen, have crashed and burned literally, whereas the Robinsons seem to hold up a little more to the impact!
I would be interested to hear from an engineer who has worked on both!