Hi, I am a programmer and I agree with your doubts. SFT is a secure way to move files between almost any two computers across open networks.
Secure FTP is very useful when you require high speed file transfer method. It indeed helps in transferring large files and that too in a secure mode. I have personally used this thing and I cannot think of a better solution to your problem. It helps in automation of file transfer processes and I believe it will help you to get rid of the fear of your data being stolen by your competitors.
Good luck and wish you success in your business.
