FYI, AWS Lambda can, and for many things, does run on edge locations (166 edge points). So your comparison is not very accurate. The right map to use on that comparison would be a CloudFront map.
Lambda@Edge does run on their CDN nodes, but it isn't quite for general-purpose compute, there's a long list of restrictions you can find here: https://docs.aws.amazon.com/AmazonCloudFront/latest/Develope...
If you're interested in the performance differences, I ran some comparisons using Catchpoint a while ago: https://blog.cloudflare.com/serverless-performance-compariso...
Lambda and Lambda@Edge also deal with things like cold-starts which impact performance irrespective of the breadth of the network. You can see some of those numbers here: https://serverless-benchmark.com/
EDIT: Fixed, thank you! I meant to double check this and just forgot before hitting publish :(
(Although since Rust can compile to WASM, it might be possible to write Rust, compile it to WASM, load that WASM in Node and run that on Lambda@Edge.)