OC makes one a target of a nefarious shooter, but CC has an element of surprise - boom!
I used to keep track of such incidents. I do not recall one recently.
As I recall, there were about 4-5 of them over decades.
There were just as many concealed carrier who were disarmed because their attacker surprised them, thinking they were unarmed. The attacker found the concealed weapon and took it. On one occasion, the person thought their firearm was concealed when it was not. He chased the person who took the firearm and was killed.
In a couple of others, the firearm was poorly concealed, so was that open or concealed carry?
Situational awareness is far more important than whether you conceal or open carry.