I can't tell you why other people are voting the way they are.

I will say that to me, it's not just about alignment on issues. Personally, I prefer Clinton due to a combination of alignment on issues, prioritization of issues, experience and history working on those issues, political and foreign policy philosophy, how much I feel the candidates will actually be able to achieve in practice on those issues, and chance of winning the general.

I also care about growing the party. Women's political participation is much higher when they have a female representative, and women break democrat. I think Clinton on a ballot would also help out down-ticket female democrats in house races (partly for this reason). I also care more about getting more women into politics at every level. These are positives to me, but they wouldn't be enough to get me to vote for a woman if the reasons in the above paragraph weren't there.

However, even those reasons don't exist in a vacuum, separate from her gender. In a system in which there is prevailing sexism, gender is not something you can cut out with an X-acto knife and treat like it's totally separate from everything else. While Clinton's specific policy stances are pretty standard Democrat, her priorities are probably shaped by her gender. For example, while I don't disagree with Sanders on any major gender issue, I don't think these issues are much of a priority for him. Personally, I am not encouraged by the way that when he's given the prompt to talk about gender inequality (or for that matter, racial inequality) he pivots right back to economic, or his words on, say, Planned Parenthood.

I also think Clinton seems to have a greater awareness of gendered issues that are less obviously so. In addition, Clinton's greater awareness of coded sexism probably also comes from the fact that she's faced it in the public arena for decades now.

She is also the candidate and campaigner she is because she's faced decades of vitriolic attacks, many of them sexist. If anyone can stand up to a billion dollars with of attack ads in the general, I think it's her--because she's been doing it for decades.

I think it's disingenuous and often vulgar the way that Clinton opponents are trying to make it look like it's only about gender, but I think it's nearly as disingenuous to act like gender is something you can just untangle from everything else in the climate we live in right now.