I do not know if these are the "best" 1 credit steaks, but my family likes them.
Tratoria Al Forno has good food and the steak is no exception, My family enjoys this meal every trip.
WE like the oak grilled steak at Mama Melrose. It gets mixed reviews, but we like it.
I also enjoy the carne asada or whatever it was called at San Angel Inn. It was seasoned perfectly and delicious.