Recommendation on MongoDB Atlas networking setup in AWS

Hello Team,

I’m new to MongoDB atlas . Can anyone explain / point me to blog post about Atlas networking access. When we should use VPC peering and private endpoint. If you can mention some use case , would be great.
In our POC env, we provisioned 2-2-1 node replicaset across us-east-1 (primary node ) , us-west-1 and us-west-2. In our account, we provisioned EC2 instance in us-east-1 and setup connection to Atlas using public IP whitelisting. We noticed high latency (~21ms) between app server and atlas mongodb primary node within us-east-1 region.
We have a plan to migrate one of our supported application to AWS and database to Atlas. Please recommend networking setup to achieve high throughput with minimum latency.