I also have only attended co-ed schools so I cannot give a unbiased comparison but I'll do my best. It is important that your decision on a school is not based solely on this. Make sure to compare the programs, curriculum, maybe even professors. But if you happen to have looked at all that and the only difference that could help you decide is whether its co-ed or not then this is what I found.
There are studies that show students at women's colleges that started a mayor in math and hard sciences are far more likely to finish their degrees and get a job in that area of study, as opposed to the number that switches to a different mayor in co-ed schools. However, I haven't seen studies about what happens after joining a coed workforce.
Overall, from my research it seems that women's college provide a great environment for women to confidently pursue an area of study without feeling alienated or out of place like they would in a coed college due to the fact that math and hard sciences in co-ed colleges are male dominated fields. As a con, there is the fact that it doesn't prepare you for a coed work environment where you interact or work with men, now if that is a bad or a good thing is out of my expertise, but I'm guessing it will depend on the person. Maybe you will have nurtured a solid confidence that is not shaken by a new environment.
There have been great women who have gone to women's college as well as great women who have gone to co-ed colleges. At the end of the day it thought it would be a big factor in your life and who your are as a person, but it definitely wont define you. It is also possible to change your mind later and that is okay to do. You might go to a women's college and love it or decide it's not for you and transfer.
P.S. I realized this comes out to seem like I'm rooting for women's colleges, I'm neither in favor or against. I loved my co-ed school I made friendships and relationships (male and females) that I know will last a lifetime. It's just that truly when I looked for unbiased comparison the only real disadvantage to a Women's college was 'lack of men' that seemed redundant to me.
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