Hi, I would like to ask if you know any better way to get statistics from routeros(detailed information about data, time, client, better statistics) like default routeros graphing tool.

The Dude does quite well. You can monitor and track any OID via SNMP etc. I have some that track and display the current number of hotspot users, then put that into a function and track that via each hotspot system I ahve. It graphs just like the existing graphs in MT. Gives me historical information.