First you will need either one of these, or both, from Forgeworld.
-Imperial Armor : Siege of Vraks. (Can be themed for Khorne or Nurgle)
-Imperial Armor 13: Warmachines of the Lost and Dammed. (All 4 chaos gods)
"Competitive" depending on how well you can play this type of army. Your models will generally be cheaper, but for a hit against its effectiveness and utility.
Main difference is less BS. Less armor. No orders. Cheaper. (Though have to buy more models).
Though you gain better tar-pit troops. Can mix in Chaos marines, chaos spawn (which are good in this book). Significant conversion and model options.
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