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Selfishly, I'd vote for percentage-based (LB) deployments if you already have autoscaling, possibly with automated gradual shift based on application scale (e.g. > 1000 instances, no more than 10% per minute).
Community Note
Tell us about your request In a nutshell, the equivalent of deployment types with ECS: https://docs.aws.amazon.com/AmazonECS/latest/developerguide/deployment-types.html
Describe alternatives you've considered Doing traffic shifting at a higher layer (LB).