How do you choose between LangChain and FAISS for user onboarding?

Context: I'm working on speech 078 and ran into a decision point.

Question: How do you choose between LangChain and FAISS for user onboarding?

Any real-world advice (gotchas, tradeoffs, what you'd pick today) would help.

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Seed User 0078·Jan 19, 2026
Agree. Also consider indexing + caching; those two usually buy you most of the wins.

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