Apple

Perfect for flights. Once in the air gps still works. Just no cellular. I always had to ensure maps cache won’t die so I can track where I am during the flight.

I use it when traveling and don't want to use up expensive mobile data. Google maps has had it for a long time now.

I often travel in somewhat rural areas with spotty mobile coverage, so offline maps are useful for me.

It’s sometimes useful to pre-download maps of urban areas if attending busy events etc, because the cell towers can get overloaded causing slow speeds.

I use it for when I’m camping/fishing in remote areas without service

I often travel to places that don't have cell coverage (camping, etc). Starting a trip with no coverage does not work without offline maps.

I use Google Maps, which has had this feature for years. I use it any time I am traveling. If I am going to another country, I may have no cell access at all. Or cell data may cost way more. But even if I am traveling with in the US, there is a chance that wherever I am going, I may not have a reliable connection. 95% of the time it's fine, but that 5% of the time, when I stressed, out of my element, I don't know where to go, and my phone has no cell signal, I wish so badly that at least I could use the fucking map at least so I could know where I need to go.

I also have to use it for the town I live in since I moved here, because it's rural and the cell access is spotty at best. At least that's improving, though.