Hi, first of all congratulation for job. Despite the similarity in name the two protocols are completely different. In FTP all data is passed back and forth between the client and server without the use of encryption. This makes it possible for an eavesdropper to listen in and retrieve your confidential information including login details. With SFTP all the data is encrypted before it is sentient across the network. Hope you will satisfy with my opinions. I wish you for your great career.
All the best!