Info? No. Recommendation? Yes. Use OpenSSH.
Why?
No 3rd party products need be installed, it supports any number of authentication methods including Radius servers, the only thing "sftp" adds to SSH is provide FTP-like file transfer commands within an ssh session. Otherwise it is just plain-old-well-understood-well-audited-and-secure OpenSSH. Authentication can be loose or broad, as it is with any SSH configuration, and all packets are encrypted, including authentication packets.
I happen to like using scp, which allows file transfer from shell commands without an sftp client session.
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