What is the best database service to plug into your application hosted on Deno Deploy?

Deno Deploy is hosted on Google Cloud, but I was wondering: is a database service from another company, but also hosted on Google Cloud, would result in a good latency that resolve inside the same region datacenter, or will it fatally get out in the internet and induce terrible latency?

What about a database service hosted on AWS then?

Is anybody have numbers to share?