Both HTTPS and SFTP are secure regarding data uploading.
What the last person said is exactly what the original post person Topmac already knows, that’s why they asked the question.
I would just like to say to Topmac I use HTTPS and everyone I know that hosts’ a secure site
uses HTTPS, I’m not an expert or even claim to know the answer to your question, but to state what I’ve stated. I don’t know anything about sftp? One sounds more like an ftp site watch more then the other, maybe that’s the difference.