Well, for plowing through crap, and just all mountain pew-pew, it sounds like the Heritage rips it up better then the SL-R. Pretty sure the Heritage kinda lacks the freestyle element too though, so if you do really like park and features, and your other board is for epic pow, the SL-R might be more what your looking for.
Note: I haven't ridden any of these boards yet, I have just faithfully over-researched them since I'm buying a Never Summer board as well. There's lots of people on this forum with actual boards, so they might be able to give you a reality check.
PowderHound and TreeNinja