I only have one final

I know this is a horrible question, but would you rather kill your own child, or your best friend's child in an accident? Everyone I've asked said they would rather kill their own child because that takes your best friend out of the picture. But how about your wife/husband. The way I think of it, I'd rather kill my best friend's child than my wife's child who is also my child. Maybe it doesn't matter, you're screwed either way.