Hmm.. I'm a member of an NPC org and an honorary. Honestly, it was a lot "harder" to get "accepted" into my honorary (which only takes 4 new members each year, and had an extensive application process) than I would consider formal rush, but Pi Phi has been much more meaningful.
I originally just had Pi Phi in my signature because this is a sorority/fraternity message board, but I later added my honorary as it is something I am proud of as well, and it is greek-related.
However, I have both orgs next to eachother (in equal size) in my AIM profile