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Domain Upgrade Server 2012 R2 Prep

I currently have 3 domain controllers all Running either Server 2008 and/or Server 2008 R2.  I will be installing and promoting 3 new Server 2012 R2 Domain controllers.  I am a bit confused as to how to prep the domain to get ready for this.

Some say the dcpromo wizard upgrades the domain automatically, and some say before introducing the new servers, run the command line prep utilities.....

What is the proper way to do this......
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does it hurt, or is it better to do it manually?
It does the exact same thing either way. the adprep command-line utility checks each schema file and applies it if necessary. And the automatic method within the wizard uses the same schema files and does the same checks.  It is like comparing dragging a file in file explorer or typing "copy" in the command line.  Windows internally handles both actions the same way (note I am just comparing copy, not xcopy or Robocopy, etc.)