User blog comment:.Rakle./Monster Hunter Online Information Blog Post/@comment-8494024-20130505200101/@comment-4009941-20130508165243

Blue next to White? you must mean the weapons people are holding on the list down there I shall explain.

Weapons on the blue right side are in your lobby set, Lobby sets as in "Equipment you wear just for decoration or show off" outside of quests.

And weapons on the left side are ones you are wearing for quests. So you can run around in your best looking armor in the lobby where citys hold 100 people at a time for show.