The people who are trying to make them equivalent are simply doing it for political partisan reasons, they're completely different.
Hillary ran a private bathroom server to exchange classified information of national security importance.
Pence used a private account on AOL to do something perfectly legal:
Using a private account if you're the governor of Indiana, where it's legal to do so and you're ostensibly dealing with much less-sensitive information, is much different than using a private email account exclusively to do work as secretary of state,who has access to many if not most of the nation's top secrets.
It's legal in Indiana to use a private email account for work. In fact, you could argue Pence may have needed a private account: It's illegal in Indiana for a government official to use her or his official account for political business.
That's why this isn't the scandal that the /r/politics posters so desperately want it to be.