I don't think you will find any hard evidence out there that either situation will have a better turn-out. There are troubled families no matter what, bad parents no matter what. And plenty of wonderful loving, well-functioning families with well-adjusted kids in both scenarios.
Good luck with this talk, it is a huge can of worms and is really hard to separate "opinion" from "fact".
I really don't think it makes a difference either way, as long as the home is a happy place to be (no matter how much time the child spends there during the day), and if there is another caretaker, that that place is also a happy place to be and the caretakers are also bonded with the children. I personally think the more people who can be loving caring adults in a baby/child/teens life the better- parents, grandparents, nannies, babysitters whatever. But I'm also not saying that those kids necessarily have an advantage over a kid who stays home with just his mom all day.
I'm a full time working mom, with reasonable hours and summers and holidays off. It's funny because when I day dream about being a SAHM (or experience a week or so of it like the recent week off I had for Thanksgiving), I find myself only noticing the benefits it would have to MYSELF, not my kid. For example, how great it is to get some errands done, sleep in later, not have to do makeup or get dressed right away in the morning, bake something, do a project, get the house clean, organize a closet, go on a lunch date with a friend... And I do enjoy having some extra time with my daughter but again that's a personal benefit to me. I guess I am fully confident that my daughter is getting a quality upbringing no matter what, so it never enters my mind that her life would be better by having me around 24/7. When I am at work, she is with another family member and having a perfectly fine time playing, growing, developing, and bonding with that person. I'm ok with that. She seems quite well adjusted spiritually, emotionally and socially so far.
I'm really interested to see how you will stretch this into a presentation and where you go with it. Please update.