Emarsys Email Domain Setup

Hello Dear Community,

We are implementing Emarsys in a large holding company, which consists of multiple daughter companies. Now we are trying to activate Email Channel, As we know we have to create a new domain with the values which are provided through the Emarsys help portal.

Which is the better approach?

1. Create 1 domain and then create sub-domains for each daughter company

or

2. Create individual domains for each daughter company

Thank You in advance.

Sandro.