Specialize when the main base gets noisy
A first base can handle early crafting, food, storage, and basic production. Once mining, oil, or breeding starts competing for space and Pal assignments, a second base is usually cleaner than another cramped expansion.
Pick the job first
The second base should have one primary job. Mining bases care about nodes and storage distance. Oil bases care about valid extractor spots and uptime. Breeding bases care about flat space, Cake logistics, and incubator access.
Avoid moving everything at once
A specialized second base does not need to replace the main base immediately. Move the bottleneck workflow first, then decide whether storage, defenses, or crafting should follow.