I've edited the last sentence in my original comment to better highlight that there's a lot more out there.
I've found that frontloading a newcomer with lots of information, whether it's OSM, the fediverse, or a similar technical topic that we are passionate about, ends up scaring away a lot of people. They'll click on the link, scroll around, then move on to the next thing.
The reason why I suggest Comaps is because it felt the most similar to mobile Google Maps, which is what the majority of people are using.
Then once they actually try it and use the app once, they're more likely to stick around and learn more about OSM. + They'll know what they want when they ask for recommendations.