Well, with the same camera, you get 100 times higher resolution from 1 km than from 100 km. But a satellite in a polar orbit overflies the whole Earth, typically, every few weeks (though keyhole-type satellites only photograph a very narrow track) while in many cases the only available aerial imagery is years or decades old. And a satellite can fly over restricted airspace (the only way to stop it from doing so, even for its owner, would be to blow it out of orbit) while doing that in an airplane is likely to get you thoroughly murdered and possibly result in a diplomatic incident.

The result is that satellite photographs are much more frequent and have much better coverage, while aerial photographs have much higher resolution. The dishonest naming of the Google Maps feature has given people extremely unrealistic expectations of what satellites can do, which results in difficulty in selling actual satellite photography products when they don't match what people have come to expect from GMaps.