As most of us know, you will have the ability to join an order in GW2. This will likely determine how you 'defeat' Zhaitan in your personal story. Or at least how you end up getting to him FOR the fight.
Here is a brief description of each order, as well as a link to the wiki pages for more information. Copypasta'd from the wiki, because I'm pretty lazy.In Guild Wars 2 there are three orders, one of which the player joins as part of their personal storyline and which determines a significant portion of the higher level parts of that story.
The scholars of the priory believe the dragon might be defeated using ancient knowledge of a past victory.
Order of Whispers
The secretive Whispers order believe the dragons cannot be defeated and must be returned to sleep.
Members of the militaristic Vigil believe a united army of all the races can defeat an elder dragon.
I'll be choosing the Vigil just to increase my chances of chillin with Ember Doomforge, and I'm assuming Vigil will be the most popular with Whispers being the least. Still, I am very curious to see what people are thinking of choosing.