>>714888776Unleashed is better for mastery because of the more stringent S Rank requirements. Generations hands those out like candy, one of the worst 3D Sonics in that regard actually
Shadow Generations is too easy to get S ranks in but it's the most fun to improve course times because the doom powers (minus Wing) add a lot of interesting routing potential, and they finally got rid of 2D sections in 3D levels altogether