Hi Dr Zyklon,
The VPN included in the Mobile Security app is the same service that you access from the SecureLine VPN app (i.e. it is the SecureLine VPN, it is just accessible from the Mobile Security app). There is no difference in the VPN service provided, only in the settings that you can access - the SecureLine VN app allows you to enable auto-connection of the VPN service (and the ability to differentiate between which types of networks it should auto-connect on), which is not currently available for the VPN in the Mobile Security app.