Why netlify and not S3 + CloudFront?
1) run a build process
2) own domain with automatic ssl and redirecting to w/e www-or-not, https-only etc
3) deploy with git push
4) url rewriting, header inserting, proxying
Typically you'll have to do quite a bit of work to get the same performance on S3+CloudFront as out of the box with Netlify, and if you do set up things to be as fast there, you'll suffer from slower cache invalidation.
https://www.netlify.com/blog/2015/03/06/comparing-netlify-an...