Hey Hdog.
Well you obviously know your stuff. There will always be variables on impact, clothing, buttons etc. Guess my point of "damage" is that a hollow point will frag whereas a slug will mushroom if the round gets to soft tissue.
To be gun specific, I've seen some .38 derringers that have horrible trigger pulls and the grips generally don't lend themselves to accuracy. That is just my argument to Hman suggesting a .38 derringer for a lady to carry. But, at the end of the day, if I have to draw down on someone I want it to be my .40 Glock or a 1911.
No argument about your observations on derringers in general. I'm not a fan though I've handled a Bond Arms derringer that I thought was ok.
I like your preferred options as I've got both of those myself.