Re the discussion of DD versus SH, the human element prob comes into play. That doesn't mean the jurors won't put that aside or OTOH, may factor (subconsciously) it in. I'm not sure what the outcome will be for DD.
Even before she takes the stand, when her earlier interviews are shown, SH appears to elicit a strong negative reaction even though pregnant. IMO, this stems primarily, from her discussion about Becky with the police, and the manner in which she comes across concerning her opinions about Becky on her video interviews.
As another poster noted, as clever as she may be, SH does not even appear to hear herself, or consider how she sounds when she speaks to the police about Becky. It astounded me!
OTOH, DD is likely charismatic; has developed people skills--something about him & his presentation on the stand that audience connected with, found him likable, believable, responded with their gut instincts