Map difference between 'TopoActive North America' and 'Coverage of North America?'

Hi All - In setting up my new epix 2 (Sapphire 32GB with preloaded maps), I updated the watch software to 7.20.  Then I get prompted in Garmin Express to update maps.  It asks to update 'Coverage of North America' and then another map for 'TopoActive North America.'  Questions:

1. What's the difference between the two?  I run and hike in mostly urban areas (Boston, MA) at the moment.  I may rarely go to desolated parts of New England, the White Mountains and what not for hiking.

2. What's the benefit to updating?  Should I do both?  Just not sure what get with the updates.

Thanks!