I don't think there's enough public data to make a good comparison on safety. Only the companies and presumably the NTSB have that data. As you mentioned, an a

I don't think there's enough public data to make a good comparison on safety. Only the companies and presumably the NTSB have that data. As you mentioned, an apples-to-apples comparison is hard. The type of driving (urban vs freeway), the location, the weather conditions, even the times of day they drive could all bias accident rates.