The biggest advantage of changing from a low population server to a high (switched from Goblin to Gilgamesh 16 months ago) is the PFs will fill faster.
A normal prime time PF list:
on Goblin has 5-7 PFs
on Gilgamesh has 25-35 PFs

As other have stated, the Duty finder for the Aether data centre performance will be the same but you will have a much easier time finding others to run stuff directly from the server population.