Without ECS, the CDN will default to the closest one to the resolver, and cloudflare has resolvers in all major cities.

Given that the vast majority of us live in or near a major city, it means that your vaguely gloom and doom commentary doesn't apply.

If you live in the boondocks or if CDN matching misbehaves for some reason, by all means run benchmarks!

But all other things being equal, Cloudflare's privacy policy is better than Google's.