Stay at home mom vs. working mom

So I was watching Dr. Phil today while getting some house work done and Reese was napping and I was astonished at the topic. They had both working and stay at home moms in the audience and they were arguing which was better - REALLY??? Aren't we past this yet???!!!

I guess at this point I should tell you my point of view on the topic - neither is better. Yes, I truly believe that. Staying at home is best for ME and MY family, that doesn't make it best for anyone else. An easy comparison in my mind is my child/family vs. my brothers child/family. I stay home - my sister in law works. My son is healthy, smart and very happy and my niece is healthy, smart and very happy. I challenge anyone to say that one of them is better off than the other.

I believe that a happy mom (really, happy parents) contributes HUGELY to a child's success and if working makes a mom happy - great - she'll be a better mom at home for it. If staying at home make her happy - again, same thing.

Obviously there are people who disagree with me, or there wouldn't be a huge debate about it on Dr. Phil today, but what I want to know is why we (women, society) feel the need to argue it out?

So what do you think - why are women so angry/hateful/ready to debate over whether stay at home moms or working moms raise better kids?

I have my own theory, but I'm curious to hear yours - so please share!!