When finding the ratio of diffusion rates, how do you know which gas diffuses faster?

Graham's law - Wikipedia
Graham's law of effusion (also called Graham's law of diffusion) was formulated by Scottish physical chemist Thomas Graham in 1848. Graham found experimentally that the rate of effusion of a gas is inversely proportional to the square root of the mass of its particles.
en.wikipedia.org/wiki/Graham's_law

What Is The Difference Between Diffusion and Effusion?
The primary difference between diffusion and effusion is the barrier which filters the gas as it moves between the two volumes. Effusion occurs when a barrier with one or many small holes prevents gas from expanding into the new volume unless a gas molecule happens to travel through the hole.
www.thoughtco.com/difference-between-diffusion-and-effusion-604279