A benefit (usually) of S3 is that since it's operating over HTTP, you don't need any additional things to make the files accessible. In case of EFS you would ne

A benefit (usually) of S3 is that since it's operating over HTTP, you don't need any additional things to make the files accessible. In case of EFS you would need a HTTP server running. Maintaining a HTTP work is extra work, extra configuration but might give you additional benefits. Thinking of small file size, EFS would probably work a bit faster (since you'd have some HTTP overhead) but I doubt that it would be significant, unless users upload hundreds of files at once. EFS advantage in this case would be that you'd no longer need a S3 library to do it, since it's POSIX compliant. Given that most languages have simple, solid libraries for interacting with it, it's not a huge difference but still :) All in all, I'd go with S3 unless there are some special requirements that are hard to satisfy using current S3 features.