Hi Gabriel - I haven't worked on Ka Te's adapter but have a look at the below blog for the advantages of using Advantco's rest adapter...
Integrating REST Services on PI
I don't see any major differences but below something i noticed in the release notes of Advantco's adapter.
Endorses Open Data Protocol (OData), a Web protocol for querying and updating data using Web technologies such as HTTP, Atom Publishing Protocol (AtomPub) and JSON to provide access to information from a variety of applications
Reference : Advantco Unveils SAP® Certified REST Adapter for SAP NetWeaver® | Advantco SAP NetWeaver Solutions