migrate SQL server stored procedures to SAP hana

Experts:

I  am preparing a migration from SQL DB to SAP Hana.

In addition to the SAP official guide for this type of migration, I also notice following blog:

http://www.sdn.sap.com/irj/scn/go/portal/prtroot/docs/library/uuid/20b5d65b-6539-3110-a181-e3474a998630?QuickLink=index&overridelayout=true&58879706678075

Above blog is about using data service to migrate from SQL to Hana.

1)      Seems it’s talking about entire DB migration, so what’s the advantage of using DS versus using SWPM?

2)      Above blog also has a big portion about migrating stored procedure. When using SWPM, we do not have to handle stored procedures separately.

I am confused.  Can somebody clarify this?

Thanks!