We love github, don't get me wrong (and we pay decent $ for it). But I'm looking at track record / experience with it doing production auto deploys for years.

We love github, don't get me wrong (and we pay decent $ for it). But I'm looking at track record / experience with it doing production auto deploys for years. S3 has 9 9s of durability and is "closer" to where our servers run so there are less possible points of failure. We have had 0 issues since migrating to s3 backed git repo 2 years ago. We still use github for day-to-day scm mgmt as you guys have tons of extra value add.