AWS — Difference between VPC Peering and Transit Gateway
Comparisons: AWS VPC Peering vs AWS Transit Gateway in AWS
TL;DR:
VPC Peering and Transit Gateway are used to connect multiple VPCs. VPC Peering provides Full-mesh architecture while Transit Gateway provides hub-and-spoke architecture. Transit Gateway gives VPC connectivity at scale and simplifies VPC-to-VPC communication management over VPC Peering with a large number of VPCs.