The only difference in actions that I see is intent and exposure of public information:

Snowden attempted to whistle-blow through reputable non-government actors (Reporters living in a very public spotlight) for the benefit of the people. Snowden's actions were driven by the belief of being a true patriot.

Hillary meanwhile willingly bypassed operation security for personal convince, benefit, and quite probably as a means of evading oversight and data retention/discovery measures. The lapse in security cannot be estimated as their practices were so poor that any measurement is not possible; it is very likely that TIMELY, SENSITIVE, information made it in to the hands of foreign powers thoughtful enough to have even 'script kiddies' attempt to breach a very publicly known server.