Say I want to compute a call price for a given set of SABR parameters.
I use Hagans approximation and compute $\sigma_B$. The rate is not zero. Should I then compute the option price using
Blacks formula (https://en.wikipedia.org/wiki/Black_model)
or Black-Scholes formula? (https://en.wikipedia.org/wiki/Black–Scholes_model)
Does it matter whether the asset is a forward or not?