No Database Environment make the System Manager feel easier to setup and maintain System Status with reason why Less care points.
SFTP under SSH can supply the Environment that is more secured , and safer.
If You are caring Various System for Various Customers, Choose The Update Assister. Because It can contain and care the Various Systems for various Customers.
Update Assister can have multi Folder Structure like Windows Explorer. If Your Target System may have multi-fold Structure, and must be cared, The Update Assister is proper.
Only Binary Install and Remote Guidance. (ESD)