The one on the left is the best one by far. However it lacks POIs and they could be useful. I'm unsure which one is better between the middle and the right one

The one on the left is the best one by far. However it lacks POIs and they could be useful. I'm unsure which one is better between the middle and the right one. They are probably at the same level. The middle one has some more POIs. The big difference is that all roads have the same color in the map at the right (the new Google Map) so you have to rely only on thickness/thinness of the line to assess the importance of a road and maybe on its label.