Which one of these parameters represent microbial activities better: TOC, or VS?

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Abhijeet Singh

Neither.

These parameters just represent the content of substrate and nothing to do with microbial activity.

Yoram Gerchman

I would go with BOD...

Bruno Peeters

Gede Adi Wiguna Sudiartha

I agree with Abhijeet Singh and would like to add that the SOUR (specific oxygen uptake rate) represent the aerobic microbial activites. For anoxic and anaerobic microbial activities similar parameters can be defined and used.