When multiple units are near a faeria node, the rule for who collects is something like left-to-right, then top-to-bottom (or maybe the other way round). I think it’s on one of the hints.
To me this seems arbitrary, asymmetric, and unexpected.
My idea is to decide based on:
If the unit has special collection abilities (fortune hunter, luduan, etc) it gets priority.
If still undecided, the newest unit gets it.
No two units are equally old, so no more steps are needed.
The mechanics section in this article describes when they added it.
It seems like they moved away from oldest unit, and use map location.
I think they should change this so there’s less horizontal assymetry - do top-to-bottom 1st, then middle to sides.