May I offer the following for you to consider as part of the discussion of OC vs CC?
About that "element of surprise" thing..........
CC and OC have the very same "element of surprise" because the "element of surprise" is really nothing more than the bad guy being "surprised" to discover his intended victim ..... has a gun.
With CC the bad guy is "surprised" to see his intended victim has a gun to defend himself with after the bad guy has already chosen his victim and the attack is already in progress and at that point seeing the gun can make the bad guy decide to stop the attack.
With OC the bad guy is "surprised" to see his intended victim has a gun to defend himself with during the bad guy's choosing a victim process and at that point seeing the gun can make the bad guy decide not to attack at all.
But either way... it was the bad guy being "surprised" to see a gun that was the actual "element of surprise".
Quite frankly... I'd prefer the bad guy be "surprised" to see my openly carried gun and decide not to attack me so I can go home and watch the 6 o'clock news coverage .... from the comfort of my easy chair..... about the CC'er who had to pull his gun and "surprise" the bad guy who attacked him.
Does OC's "element of surprise" really work? Well.... there have been thousands of folks open carrying in many States (Like Arizona) for decades! and yet accounts of folks OC'ing being attacked are rare. And you know with the anti gun media any incident involving an open carrier being attacked would be covered over and over and over yet such has not been the case in the past nor is it now.
And, in my not so humble opinion, because CC's use of the "element of surprise" is only effective after the attack has begun but OC's use of the "element of surprise" can prevent an attack from happening............. OC's use of the "element of surprise" is far superior to CC's because....
I'd much rather watch the 6 o'clock news than to BE the news.