Dont forget that most european state mapping projects get integrated into OSM and the data is often better than what Google has. Their only upside is all the tracking data so they know where people currently dont drive. Something open source apps (and most likely even commercial european ones) wouldnt dare to gather.
You'll be surprised. I cannot speak for Organic Maps, but I can speak for OSMand tested for years in Germany and Japan. Same OSM data at the end of the day. Even today, OSMand distinguishes better between building blocks. I see subdivisions of address numbers, which Google Maps hides with it's minimalist grey for the whole apartment block design.
Further more, I often see small walkways and paths simply not represented in Google Maps, whereas they are in Google Maps. And for some reason, here in Japan Google Maps often suggests too-clever for its own good detours, which end up being way slower, whereas OSMand with it's simpler(?) navigation algorithm sticks to more consistent routes along bigger roads.
If address and POI search could be further improved, I wouldn't see a reason to use Google Maps ever again.
What I miss in Organic Maps compared to OSMAnd is being able to choose a category of POIs which are then shown even when zoomed further out - useful if you are looking for e.g. restaurants nearby.
For some data in some part parts of the world. In rural (and even suburban) Sweden for example half the buildings are missing, many roads aren't named and search is straight up broken. What it will give you over Google is that every hiking trail and bike path is included.
For my part this works well enough on OSMand/Organic maps but what they lack is traffic information.
On my main route there can be anywhere from 0 to 1h of traffic, and Google maps seems to be very accurate at estimating it.
Anytime I don't need traffic info, I use another map application because Google maps had all kinds of errors and missing information, but no other app has reliable traffic information (I realise Google has it because people use Google maps, but I wish it was different).
Organic maps has large labels, building numbers, a lot of relevant details visible, I can immedeately find the area I am interested in, see all possible routes, find addresses by sight etc.
It does not matter how much information google has, if it does not show you anything at all.
Technical capabilities. But not incentives, and not even capabilities without the qualifier "technical", for the simple reason that they as companies can't decide to not do the evil or stupid thing for the sake of not doing an evil or stupid thing, only ever for other reasons. The bright people at Google or Apple can't decide "fuck it, let's just do something that's actually good instead of what middle management and fucking marketing thinks is software". They do not have that option, any rando is more free (though not necessarily capable) to make something great than anyone at any of these large "players". OSS can turn bad and be run into the ground too, of course, but not necessarily, while these giants pump out crap because there is no way they couldn't.
See image at https://wiki.openstreetmap.org/wiki/Google
(but it uses approximately no OSM data)
OSM-based apps are much better for "I'm in a middle of nowhere and want to understand the detailed topography of the place, and see what's available in the village".
Since COVID, these hours could have been hallucinated up by ChatGPT and be more accurate, at least in Europe.
It's not the most complete data but it's by far the fastest mapping app when using offline data. Most intuitive point and click routing. Elevation data. Ability to load GPX/KML if you hike. And it will blow your mind how much is contained in the offline data: wikipedia articles, open/close times, etc
Campgrounds were even worse... In Jasper about 90% of the camp trails were on OSM, Google had none. And I took the opportunity to add the rest because OSM is editable by anyone. Google's "ground truth" effort is an abject failure.
For hiking, OSM data and by that OsmAnd and Organic Maps are just massively better and have more paths, with an better interface and visualization, which also works perfect offline.
For cars and routing, and finding special shops sure google is bettwr - on the other hand here I am on a tourist island and Google marking certain roads blocked though they are not (and by that, making more cars turn early, so this is a positive feedback loop? Thought by just driving the road multiple times I could fix that, but not that easily :D)
Apple does, Google doesn't!
All the business and places (so you don't have to remember the exact address for a place, just enter the name), schedules, traffic, temporary route changes (like road workers, accidents or the like...). That conveniences are great.
OTOH, in OSM you have all the metadata accessible and free. Trash bin locations, type of roads, traffic lights, tactile floor for blind people, number of steps on a stair, type of buildings...
But where I use OSM the most (almost always) is out of the city. For hiking, bicycle routes, out in the field...
Priorities.
Google Maps exists as a place to show ads.
Organic Maps exists to be a map app.
Apple Maps doesn't even support bike directions. I live in Copenhagen, therefore making Apple Maps pretty useless. It's a classic Silicon Valley app made for the tech boomers in charge at Apple who presumably drive everywhere in electric cars.
Google Maps is better at bike directions, but when I use it for public transportation it's now trying to sell me on routes where I need to rent an e-scooter instead. I only use public transportation (as opposed to riding a bike) when I need to bring our baby somewhere with me. Since there is no way to turn this "feature" off, the directions are often useless to me. I now use a Danish app for all public transportation directions.
Just about the only thing Google Maps is clearly better at is satellite images and open/close times for shops.
I fully believe that OSM apps already beat it for specific use cases (e.g. Organic Maps for tourism, OSMAnd for cycling & hiking, etc.), and I don't think that being small & open source is a real limit even for an all-purpose maps app, as long as the big players like easy money more than providing features & value to the user, and don't feal threatened by any of the alternatives.
TL;DR: it's good for competition and Google Maps isn't really that good, as long as it's enough to still make loads of money.
Pretty sure Google doesn't use OSM