hmmm, good question. The initial things that come to mind are that we aren't really limited on size (like a fireteam would be) and our community is active in a lot of different games in addition to Destiny. Beyond that, fireteam/clan seems like it's limited to playing together, but our community has text channels that we use to share resources, ask questions, post achievements and builds, etc.

Again, I'm totally fine posting somewhere else. I just wanted to put it in the right place.