Hi Jijo,
Homeseer and MainLobby and CQC are full boat software automation systems. Just add hardware and labor, with a dose of expertise.
Homeseer and MainLobby have a means to integrate the two systems which provides probably the most capable automation system anywhere. Not much that can't be done with the two.
But, there is a lot of overlap between the two. And, there is more to configure as you have to then learn two different systems. And, both sides have to be working well for a reliable system (not difficult in the scope of the overall tasks).
Homeseer historically has really lacked a polished user interface. That is why the MainLobby integration was originally developed as MainLobby (IMHO) has the best user interface capability and end result. When the integration was written, MainLobby didn't have as robust of a "back end". Since that time, MainLobby has had hundreds of updates and has a very capable "back end" now as well (that accomplishes just about anything one would typically automate in a home).
Homeseer is working on their own user interface application. No evidence on what it's capabilities or end results will look like yet. Suppose to be available to beta this or next month. I suspect it will take quite some time before it compares to MainLobby (again, IMHO).
MainLobby and Homeseer (and the integration component MLHSPlugin) are all available for demo. Give it a whirl.