• Will you perform few searches?
• Do you need exact results?
• Then: "Flat"
• Is memory a concern?
• If not: HNSWM or IVF1024,PQNx4fs,RFlat
• If somewhat, then "...,Flat"
• If quite important, then OPQM_D,...,PQMx4fsr
• If very important, then OPQM_D,...,PQM
• How big is the dataset?
• If below 1M vectors: ...,IVFK,...
• If 1M - 10M: "...,IVF65536_HNSW32,..."
• If 10M - 100M: "...,IVF262144_HNSW32,..."
• If 100M - 1B: "...,IVF1048576_HNSW32,..."