WINSCP is a very good GUI for SCP , for those who don't know what is SCP.
SCP/WINSCP is a client that uses SSH to transfer file from a computer to another, Since it uses SSH it utilize encryption for everything transmitted, which gives you peace of mind. This Secured file transfer is called SFTP (Secured FTP)
We need to distinguish between SFTP and FTPS (FTP is using FTP with the help of SSL/TLS to transfer files securely) most of the known FTP clients support FTPS.
So to summarize FTPS is FTP under SSL.
SFTP is transferring files over SSH (port 22).
WINSCP has a Commander interface and Synchronization option