Which mobile Apps or Extension work well for what scenario
Here is an initial list - hoping we can collectively flesh this out so it is a useful reference document

CiviContact - AgileWare


Android and IOS


CiviMobile - AgiliWay


Android and IOS


SmartCivi - ArtTech


Android only


CiviMobile Extension - WebAccess

NOTE: I will do my best to update this list with more info/summaries if folk post Comments or separate Answers