Aircraft, be they aeroplanes or helicopters,are not themselves unsafe. In the hands of someone with an incorrect or inappropriate attitude, inadequate training or poor airmanship - they are potentially lethal.
Statistics are no way to decide which is more dangerous or potentially unsafe. They will both bite given lack of attention to detail.
I fly both. I am happy to say that after some 31 years as a Pilot, neither have proven to be more unsafe than the other.
As I say - misbehave - and they will both bite. What statistics do show though, is that 9 times out of 10, it's Pilot error. Nuff said.