Laiden ego's for A are level 110 and give 14,200 xp if they are white (which they won't be)
Laiden ego's for B are level 95 and give you 10,078 xp if they are white (which I think they are).
So I would say to do B until 105 or so, and then go to A. Just do a run of each and compare the xp of the egos. Whichever one is higher is the way to go