Latest recommendation for storage driver in Ubuntu?

Hey. Just a quick question: what’s the latest recommendation for storage backend for Ubuntu 16.04? I found a post from six months ago that OverlayFS was a bit unstable; has it become more stable since then? Or is AUFS or Devicemapper the current recommendation?

For context, I’ve been having some issues when 10+ servers try to pull from the same single registry at the same time; some take way too long, time out, etc., and I’m thinking it’s an issue with the storage driver. I’m using S3 as the storage device, for what it’s worth.