Difference between Custom Agent vs. create_openai_functions_agent - What I am missing here?

[mraguth]

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Example Code

Reference: 
https://langchain-ai.github.io/langgraph/tutorials/multi_agent/multi-agent-collaboration/#create-agents

Description

In this example: https://langchain-ai.github.io/langgraph/tutorials/multi_agent/multi-agent-collaboration/#create-agents

I suppose to use this below:
from langchain_core.prompts import ChatPromptTemplate, MessagesPlaceholder

from langgraph.graph import END, StateGraph, START


def create_agent(llm, tools, system_message: str):
    """Create an agent."""
    prompt = ChatPromptTemplate.from_messages(
        [
            (
                "system",
                "You are a helpful AI assistant, collaborating with other assistants."
                " Use the provided tools to progress towards answering the question."
                " If you are unable to fully answer, that's OK, another assistant with different tools "
                " will help where you left off. Execute what you can to make progress."
                " If you or any of the other assistants have the final answer or deliverable,"
                " prefix your response with FINAL ANSWER so the team knows to stop."
                " You have access to the following tools: {tool_names}.\n{system_message}",
            ),
            MessagesPlaceholder(variable_name="messages"),
        ]
    )
    prompt = prompt.partial(system_message=system_message)
    prompt = prompt.partial(tool_names=", ".join([tool.name for tool in tools]))
    return prompt | llm.bind_tools(tools)

However, I am using 'create_openai_functions_agent'. Is that ok?

def create_openai_functions_agent(llm, tools, system_message: str):
    """Create an agent using Azure OpenAI functions."""
    # Create the prompt template
    prompt = ChatPromptTemplate.from_messages(

My question here is what is the downside of using 'create_openai_functions_agent' instead of 'custom agent' in LangGraph?
Am I missing any???? Thank you for your feedback.

System Info

Name: langgraph
Version: 0.2.35

[mraguth]

And also what is the down side of using 'create_react_agent'.....thoughts?