The amount of detail OSM has on Artis, the Amsterdam zoo, is insane.
Also, until quite recently (and maybe even still today) Google Map was terrible at bike routes in and around Amsterdam, whereas OSM was excellent at it. I remember how Google ignored major bike routes and tried to send you over highways or footpaths instead. Nowadays they just send you along bike paths next to major car thoroughfares, instead of sending you along the major bike thoroughfare that's discouraged for cars, running parallel to it.
Also, until quite recently (and maybe even still today) Google Map was terrible at bike routes in and around Amsterdam, whereas OSM was excellent at it. I remember how Google ignored major bike routes and tried to send you over highways or footpaths instead. Nowadays they just send you along bike paths next to major car thoroughfares, instead of sending you along the major bike thoroughfare that's discouraged for cars, running parallel to it.