Difference between writing a ATM put option and buying a future

Same stock -

a) I write/sell an ATM put option

b) I buy a future

In both cases I am ready to buy the entire lot size in cash if the stock falls.

Which option - a) or b) is better in terms of risk-reward basis

As you are shorting the put and buying the future… seems like you are in long… in both sides…, so both has equal risk.

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