This is the only thing that concerns me. From what I've seen both bastion and harb have terrible pug pvp and quite strong rated teams. Other then that it's really a population choice.
As it stand harb is much bigger, about 250 imp and 200 pub 50's on now, compared to 130 imp and 96 pub 50's on the bastion.
As it stands I think ewok are going to go to the harbinger.