After you have read the storage driver overview, the next step is to choose the best storage driver for your workloads. In making this decision, there are three high-level factors to consider:
If multiple storage drivers are supported in your kernel, Docker has a prioritized list of which storage driver to use if no storage driver is explicitly configured, assuming that the prerequisites for that storage driver are met:
If aufs is available, default to it, because it is the oldest storage driver. However, it is not universally available.
Reference: https://docs.docker.com/engine/userguide/storagedriver/selectadriver/

There is no such thing as a cross-region ELB, nor such thing as a cross-region Auto Scaling Group, nor such thing as a DynamoDB Multi-Region Table. The only option that makes sense is the cross-regional replication version with two ELBs and ASGs with Route53 Failover and Latency DNS.
http://docs.aws.amazon.com/amazondynamodb/latest/developerguide/Streams.CrossRegionRepl
.html

Explanation
Using User data and cloud-init directives you can always ensure you download the latest version of the LAMP stack and give it to the development teams. With AMI's you will always have the same version and will need to create an AMI everytime the version of the LAMP stack changes.
The AWS Documentation mentions
When you launch an instance in Amazon CC2, you have the option of passing user data to the instance that can be used to perform common automated configuration tasks and even run scripts after the instance starts. You can pass two types of user data to Amazon CC2: shell scripts and cloud-init directives. You can also pass this data into the launch wizard as plain text, as a file (this is useful for launching instances using the command line tools), or as base64-encoded text (for API calls).
For more information on User data please refer to the below link:
* http://docs.aws.amazon.com/AWSCC2/latest/UserGuide/user-data.html