If you want to find out the difference between the data service and modeler in Hana studio, you come to a right place, so let us start with it.
Data Services is a tool which deals with the ETL that means (Extraction, Transformation and loading) however the modeler is the admin and the modeling tool, besides this modeler is a tool that is further used to generate the objects so that it will make you easy to evaluate the data stored in SAP HANA. Although in simple way you will be able to fetch the data from the social media network with the help of data service and by using the reduce framework which is known to be Hadoop and later it will store it in SAP HANA.
At the time of loading it to SAP HANA, you will be able to work on the specific data so that it would be purified and authenticated before it is stored. If you want to have the perfect erections so that the data can be evaluated and described appropriately you can easily use modeler for this kind of situation. The erections will also offer you well-organized patterns to the particular data, so you ought the modeler to fetch the stored data in HANA.