The GameTribe version is the European version of DOMO. GameTribe is the online game branch of Game Media Networks.
GameTribe started hosting DOMO some weeks before Aeria, but game content are generally introduced, with some exceptions, at an equal phase between the two versions. The GameTribe version tend to get new maps and similar features first though, while other content, especially cash items, gets introduced on Aeria first.
Base game mechanics are the same in both version, but some secondary gameplay content differs (titles, npc/monsters name, sold content...).