With El Capitan, Maps gets transit directions and, thus, erases a glaring omission that has existed since Google Maps added the feature in 2009. And Apple's public transit maps are better than Google's in two ways:
1. If you zoom in far enough, Maps shows the shape of subway and bus stations and labels the entrances and exits to help you navigate your way in and out of unfamiliar stations.
2. Where Google shows you the time of the next two trains or bus, Apple shows you the number of minutes until the next two trains arrive, saving you from checking the current time and performing a calculation.
To view a public transit map, click the Transit button in the upper-right corner. You can also get directions via public transit by clicking the Transit button in the directions panel.
While the headliner with Maps is the addition of public transit maps and directions, iPhone-owning car drivers will be more interested in the new share item that lets you send a location or directions to your iPhone. Click the share button at the top of Maps and choose to send a location or directions to your iPhone.
For more, get all you need to know about OS X El Capitan.