What are the main differences between a sharepoint site created from (SharePoint admin center >> Team Site) and a sharepoint site created as part of creating new Office 365 group

I am getting confused on what are the main differences between creating a sharepoint site, from (SharePoint admin center >> Team Site(classic experience) ) as follow:-

and between a sharepoint site which get created as part of creating a new Office 365 group, as follow:-

now when i created a new Office 365 group and i checked the sharepoint site which get created for us, i found that it is a team site which comes with predefined lists. but for me as an experience person in SharePoint, i can within 1 hour add the same lists and libraries inside the classic team site..

and seems both sites share the same site setting and site permission settings + site columns and content types. so can i be very naive and say that office 365 sharepoint site, is nothing more that a classic team site with predefined lists and libraries !!!.. and that a classic team site can be modified to look like an Office 365 sharepoint site, by adding the missing lists and libraries ?? Or there are differences i am unaware of?

second question;generally speaking,  when we should use (SharePoint admin center >> Team Site) and when we should use Office 365 group's sharepoint site??