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There is no one-size-fits-all answer when it comes to the most optimal model for PUB/SUB as it depends on the specific use case and requirements. However, some of the commonly used models for PUB/SUB include:

1. Centralized model: This model involves a central messaging server that manages the distribution of messages to subscribers.

2. Decentralized model: In this model, subscribers directly connect to publishers and receive messages from them without any intermediate messaging broker.

3. Hybrid model: This model combines elements of the centralized and decentralized models to provide a flexible and scalable solution.

Ultimately, the most optimal model for PUB/SUB depends on factors such as scalability, reliability, performance, and security requirements of the application.