Timetrace DB Config in AppServer web.config

We are using the Identity Manager 9.2 and I'm analyzing some improvements in the setup.
One improvement is going from direct DB connections to ApplicationServer connections. That is for security reason.

There are two option to configure timetrace DBs.
One is in the Designer and one is in the web.config of the application server.

As far as I see, the application server takes into account what is entered in the Designer, even if there are no timetrace db entries in the web.config.

Is there any advantage, if we configure the connections in the Designer and the web.config?