Is method two applicable for VPC's connected via TGW?
That's an excellent point @E Gabrielli. Being able to reference like that is another very helpful way of allowing access.
@PK might be helpful to take a look here: https://docs.aws.amazon.com/vpc/latest/tgw/tgw-vpc-attachments.html You wouldn't be able to reference them across the attachments
Just a little add-on: you can reference a Security Group in another account (provided there is a properly set cross account communication via VPC peering for example, of course) prefixing the account ID followed by a slash to the SG id itself:
Maybe it's a 4th way or just a variant on the 2nd one :)
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