Some people say that Google maps is so much more useful and has up-to-date information and details etc.
But that's true only if you're driving lol and even then barely. Mostly because Google managed to monopolize some outworldly access to APIs and other proprietary information that gives them an insane insight into traffic and roadworks info etc.
If you care about walking or cycling Google Maps are actually dogshit and OSM will have unbelievably more detail and information that is displayed in a way more useful way