Rag tech stack during development and deployment

Hey there, I am just a beginner to RAG and in our company we are trying to integrate rag to our current platform. So what are the tech stacks that we can able yo use?

The main thing is that during the development and deployment how most the companies are choosing the tech stacks considering the cost and all....

When i searched on chatgpt i got the answers like this

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DURING DEVELOPMENT TIME :

Embedding Model : Nomic Embed Text (via Ollama)

Vector Database : ChromaDB

LLM : Llama 3 (via Ollama)

RAG Framework : LangChain (optional)

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DURING DEPLOYMENT TIME SWITCH TO

Vector DB : Qdrant / Pinecone

Embeddings : Azure OpenAI

LLM : GPT-4o

RAG Logic : Custom (minimal LangChain)

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So what about this understanding???