RetrievalQA vs. VectorDBQA

[bizrockman]

Hi,

VectorDBQA is marked as deprecated. So I started to use RetrievalQA.

But the results are different. VectorDBQA gives a better performance than RetrievalQA.

For me both are looking more or less the same. I tried in different scenarios.

model = RetrievalQA.from_chain_type(llm=OpenAI(temperature=0.5), chain_type="stuff", retriever=vStore.as_retriever())
model = VectorDBQA.from_chain_type(llm=OpenAI(temperature=0.5), chain_type="stuff", vectorstore=vStore)

For me both lines should be giving me the same results, when querying the model.

Does anyone has an explantion for me?