Just looking around at both, there's two main differences. First is the Next.js support right off the bat, Amplify has Lambda support but doesn't optimize automatically. Next is that this is much cheaper. Building isn't done on AWS so using something like Github actions saves you the $0.01 per build minute. Amplify offers 15gb free bandwidth with $0.15/gb in paid version. CloudFront offers 50gb free bandwidth and no more than $0.12/gb. In certain cases Amplify is a better fit but Ness has its place.