It depends on the amount of data to be transferred. Out of all three snowmobile can transfer the most amount of data. It can transfer data volumes of petabytes (PBs) to exabytes (EBs). It can be best used in case of moving an entire datacenter.
PowerUserAccess is an IAM policy in AWS. It provides full access to all AWS resources and services but does not allow management of users and groups. You can attach PowerUserAccess to your users, groups, and roles.
AWS IAM is used for identity and access management in AWS. It provides security and better resource organization in AWS.
The S3 Standard storage class is the default for objects uploaded to Amazon S3 unless a different storage class is explicitly specified during the upload process.
A VPC Peering Connection is a networking connection between two Amazon Virtual Private Clouds (VPCs) that enables resources in those VPCs to communicate with each other privately, as if they were within the same network.