Have run the same size campaign on lambda and cloudflare now, so can probably speak from experience.

Cloudflare definitely has a place, but is definitely nowhere near as feature rich as the AWS ecosystem. For this use case it was perfect. Lack of warm up and responsiveness on cloudflare is a strong draw.

Here is my previous article on our AWS donation system.

https://read.iopipe.com/the-journey-to-90-serverless-at-comi...