Digimon World 1 as my favorite game ever, not only for Digimon, but in general, its inspiring to know that the gaming paradigm can expand to new horizons and always keep being innovative, Digimon World 1 is probably one of the most innovative games of its time.
And for anime, I'm between Tamers and Savers, both are really close to represent the original plot of Digimon from 1997 and both feel more mature with interesting plot points and character development.