What is the difference between the 3 factions? It tells me to choose 1 of 3 factions and I can't do the others unless I reset my character, but it doesn't tell me anything about any of the 3 factions besides what I already know about the PLA. Also how long are the quest lines? Are they all the same length? Is one more exciting than the other? Does one give better gear? What items and vendors can I expect to unlock with each faction? The game doesn't really tell me anything despite making me choose blindly.