Hello - what is the difference between Pulumi Crosswalk for AWS VPC (https://www.pulumi.com/docs/guides/crosswalk/aws/vpc/) and the Pulumi AWS Quickstart for VPC (https://www.pulumi.com/blog/aws-quickstart-registry/)? Do they serve different purposes, is one more up-to-date or more recommended for use?

I'm not familiar with the Quickstart package, but I can speak on AWSX. The AWSX 1.0 beta is what I would recommend you use for a full VPC component. https://www.pulumi.com/registry/packages/awsx/api-docs/ec2/vpc/