Good article. I don't think it's who you love *more*, but about how you express that love and divide your time.
http://shine.yahoo.com/parenting/loving-husband-more-kids-key-good-life-181900983.html
And this is nothing new; they've been discussing this in Pre-Cana classes, parenting seminars, and marriage counseling forever. I will say that I think this article makes it seem like an easy decision, and an easy action, whereas I find it tricky, especially when you have dependent young children.