Defender >>EndpointSecurity-Reports-Summary Vs EDR Onboarding status

I have a query related to MDE >>Endpoint Security>>Endpoint Detection and response 

To check how many devices are on boarded noticing 2 menus 

i.e. summary and EDR Onboarding status. 

What is the difference between Summary and EDR onboarding status ?

Which menu value has to be factored in identifying the total devices that are onboarded successfully in MDE in a tenant?