Direcorist supports two types of maps out of the box by default. These are Google Maps and OpenStreetMap. However, you can use a single map at a time on your site. You can either use Google Maps or OpenStreetMap at time. You may already know it is free to use OpenStreetMap. However, you may use Google Maps for free with limited quota provided by Google. You can use Google Maps by buying a premium plans if you exceeds free quota. Now it is upto you which maps you would like to use on your site. It is good to know that the Map View Layout of Directorist listings works with the Google Maps at the moment.
However, we will try our best to add the support for map view layout to OpenStreetMap in a coming release.