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With the new changes it looks like a CSM army with demon allies is the way to go.

This might all change with the new book, but as of right now CSM has a lot better troops, and the demons have much nicer HQs. Specificially the special character HQs that give army wide buffs.

The top two seem to be Epidemus in a death guard force, with as many MoN troops as you can field, or Fateweaver in a Thousand Sons force, where his rerolls to invulnerable saves should make stuff like Tzeentch Terminators a nightmare for anyone to deal with.

Both lists are extremely fluffy, and look pretty competitive.

If you go demons the flying godzilla list looks pretty cool, but you might not even want or need to run allies there. All the big stuff with wings, fateweaver for rerolls, keep em flying and tear stuff up with shooting/vector strikes.