In the context of the question both these numbers are a way to measure the shape of the Volatility Smile.
Risk Reversal gives a measure of vol-skew.
25 Delta Risk Reversal = Vol 25 Delta Call – Vol 25 Delta Put
Delta Strangle gives a measure of the curvature of the volatility smile.
25 Delta Strangle = ( Vol 25 Delta Put + Vol 25 Delta Call ) / 2 – Vol ATM
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