Welcome back to Eorzea,

Firstly, you can check the following link to get a glimpse of the worl status:
https://eu.finalfantasyxiv.com/lodes...23e07acb3d22f6

The status gives you an overall idea of world population. When a world is overpopulated SE will lock them temporarily from character creation and into the world transfer.
My suggestion is to play in the standard world which usually having a solid community. Looking at each world forum can also give a glimpse of world activities.

SE just tweak the party finder function which allow player from across the world in the same data center to run dungeons/trial/ raids together.

So overall, it's not bad to be in a less congested server, you have more chance to kill hunts and lagging, the big disadvantage is the world economy in term of market prices..