Failure mode
Comparing accident statistics for different machines is pointless.
The one that that should never ever be allowed to happen is the main rotor head departs during flight!
I would expect if an airliners wings fell off in strait and level flight and then it was "fixed" only to happen again a short time later that type would never fly again.
The gearbox should be able to fail without losing the rotor head. I would rather see this on a specification sheet than all the run-dry toss.