Barring any economic melt down or international crisis I believe Hilary Clinton is most likely going to win.
It has less to do with her as an individual and more to do with the platform of the parties offerings at this time. (Affordable health care, raise in minimum wage, restructuring student loans, immigration reform with a path to citizenship, "marriage equality", The Lilly Ledbetter Fair Pay Act , Pro-Choice, Maintaining Social Security and Medicare as is, more Climate Control initiatives, restoring voting rights provisions that were taken out of the Voting Rights Act.)
Essentially there are "goodies" for every demographic of the nation.
On the Republican side ( Repeal Obamacare, restructure Social Security and Medicare, cut taxes, defund Planned Parenthood, remove some government regulations on business, strengthen our borders, tear up the Iran deal, move forward with the Keystone Pipeline, and put boots on the ground to fight ISIS and possibly Syria or Iran.)
Generally people vote their pocketbooks and their ideology.
When one looks at the party platforms as opposed to the candidates I believe polling suggests there are more people in favor of what Democrats are promising and in Hilary's case her husband Bill Clinton is still the most popular living ex president. Rightly or wrongly some people will vote for her with the idea of with Hill you get Bill mentality.
Another group of people will vote for her in an effort to make history.
However I believe most Democrats and Republicans vote for their party's candidates 99% of the time. It's "swing voters" and "independents" who tip the scale. These are the ones who will be examining the platforms/solutions rather than voting for/against the individual because they like or dislike them.