How to choose the best routing protocol?

When it comes to selecting the optimal routing protocol, it's crucial to consider several factors. Can you elaborate on the specific requirements and environment of your network? Do you prioritize reliability, speed, or scalability? Are there any constraints, such as budget or compatibility with existing infrastructure? Understanding these aspects will guide us towards a more informed decision. Additionally, how important is the flexibility to adapt to future changes and innovations in the field? Share your insights to help us navigate through the complexities of choosing the best routing protocol for your unique needs.