Hi,
IF you are in BASIS go for C_HANATEC_1 and if you looks more on technical, go for C_HANAIMP_1
C_HANATEC_1 - SAP Certified Technology Associate - SAP HANA 1.0
The technology associate certification covers a lot of technical and operational details around SAP HANA. It's suited for SAP Basis consultants and DBAs. This certification covers more on technical terms of memory management and installation of HANA.
C_HANAIMP_1 - SAP Certified Application Associate - SAP HANA 1.0
The application associate certification is more on the application of HANA software in the client's/business requirement. It deals with the data modelling, report creation, implementation of HANA, creation of tables/views as per business requirement.
Regds