Dungeoneering XP Base Value:
The base value of XP you receive at the end of a floor, before it is increased or decreased by other factors, is determined by the following:
Floor - the dungeon floor that you are raiding
Prestige - a total derived from the number of individual floors you have raided
The deeper the floor, the greater the relative difficulty of the creatures you face. So, to maximise the base value of XP you gain for a raid, you should aim to be raiding the deepest floors that you possibly can. The party leader determines the floor of the dungeon.
You are also rewarded for raiding a great variety of floors, rather than continuously raiding the same floor. This is represented by the Prestige total. To maximise this value, it is best to complete raids of as many individual floors as you can. For more details on prestige, click here.