S3 is designed for being used by applications via API, for example you can easily save and retrieve files from it even with a JavaScript application. It is much more difficult to do the same with sshfs
If instead you use it mounted on a computer, S3 is worse because each time you need to list its contents that’s an API request, if you have hundreds of thousands of files then it’s thousands of API reuqests
S3 is designed for being used by applications via API, for example you can easily save and retrieve files from it even with a JavaScript application. It is much more difficult to do the same with sshfs
If instead you use it mounted on a computer, S3 is worse because each time you need to list its contents that’s an API request, if you have hundreds of thousands of files then it’s thousands of API reuqests