[aeternus]

>decide, later on, which chains hold value

How? Who decides?

This is really where every PoS algorithm seems to break down. The whole idea of blockchain is to build a decentralized consensus, and PoS just handwaves it away.

[diegocerdan]

>Who decides?

Every user of the system.

>How?

Mostly by taking in consideration the differences of the software from both chains.