If so, what version, (1.3.0 or 1.2.3) neither has seemingly been updated since the verry recent release of HDP 2.5.
Neither. Cloudbreak 2, which will be launched in a few weeks, is the appropriate version to deploy HDP 2.5
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Cloudbreak 1.4.0 can deploy HDP 2.5, see my other answer here: https://community.hortonworks.com/questions/54346/which-version-of-cloudbreak-is-the-latest-123-or-1...
You can also look into "Hortonworks Data Cloud" that's an AWS only solution built on top of Cloudbreak with a simplified UI and with the capability to deploy 2.5: http://hortonworks.github.io/hdp-aws/