Spot Nifty or Futures Nifty what we have to consider in OI

I consider OI as Resistance and Support most of the times I trade but I have a doubt regarding what we have to consider.
Shall I consider NIFTY 50 Spot as the instrument or NIFTY FUTURES of current month.

Thanks for ur answer in advance.

Nifty spot is just an underlying which has no trades on it, OI is on particular contract, future in this case.

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what I mean to ask is what we have to consider NIFTY Spot or Nifty Futures if we consider Call Put OI as Support and Resistance