Snowden exposed a mass surveillance program, some of which appears to have been illegal. Raines did likewise, but also exposed a serious campaign of harassment against activists - one prosecuted by an FBI director who was apparently viewed as beyond the control of even the President.
I think some of the more technocratic types I know might say Snowden's leaks were about "agencies doing what they should", while Raines' was a necessary reaction to an out-of-control administrator.
If there are people who support Snowden but oppose Raines, I'd be fascinated to hear what rationale that uses - nothing comes to mind.