I think that trump should do an internal investigation of both individuals and if appropriate pardon but these two are highly different in what happen.
Assange was a foreign journalist that printed secret materials. I think that a pardon might be possible.
Showden worked for the NSA. you cant pardon him. he might of had noble reasons for what he did but his was a betrayal of the organization. the best that he should get is some sort of deal where he serves time at the very least 10 years. he might of had noble reasons but he broke trust with the agency.
The NSA under Obama has become an evil gestapo organization.
Trump should build a glorious statue of Snowden on the National Mall, next to the Lincoln Memorial.