I've been having the same dilemma at times. I think it's important to consider what might be best in terms of a job placement, which program may have scholars with more connections that can help you get a competitive job. But it's also important to consider your happiness, your emotional needs, and the level of support you can get from your university.
U of M is a really great school, and the folks in the Women and Gender studies dept. are great. Not too familiar with the history dept, but I know the American Studies dept is solid too. And Ann Arbor is a nice college town, but it can get sort of claustrophobic. I think the best thing is to assess the decision after your visit and not get too hung up on the ifs and or buts until you've seen it first hand. Then weigh your options and really think about emotional well being. A lot of folks don't realize it, but your PhD could take anywhere between 5 to 7 years. That's a substantial chunk of your life, it's useless to waste it being unhappy when you may have been perfectly content with an equally solid education elsewhere.
A rose by any other name would still smell as sweet, right?
Best of luck!