While there's alot of unknowns at this point, my money would be to stick with S3. Serving static files quickly is a large part of what it is designed to do. Fro

While there's alot of unknowns at this point, my money would be to stick with S3. Serving static files quickly is a large part of what it is designed to do. From what I'm reading here, EFS seems more geared towards shared volumes where it being a filesystem is a critical part of the interface. If you can get away with not needing a posix filesystem layer over your datastore, you should.