I'll agree that what layers a map ought to show is a subjective matter. But if you have two maps and they both have a shared subset of layers, you can (for tha

I'll agree that what layers a map ought to show is a subjective matter. But if you have two maps and they both have a shared subset of layers, you can (for that subset) objectively evaluate which map more accurately represents the real world, eg: has more objects than the other map, and/or has objects marked more accurately. And what I'm saying is that for the layers that they have in common, I think OSM wins hands down.