Hi Jaya,
Before taking a decision try to know if the SAP SFTP adapter fulfill your requirements. There is a good comparative with the Advantco SFTP adapter in this blog SAP PI SFTP Adapter vs Advantco SFTP - Srini Blog
With AEdaptive you have this thread where Srinivas talks about his experience SFTP adapter provided by SAP vs Aedaptive
Regards-