Sorry DK but I gotta go with the
Guard on this one.
The amount of armour that Hairy is bringing to the field plus the lack of significant cover to shelter from the expected barrage will put a dent in the Chaos force. It could go the way of Chaos with the Raptors and Bikes speeding over into the midst of the IG armoured blitzkrieg (where I imagine the Russ' would be hesitant to fire) and taking out a couple of chimeras and tanks, but the general manoeuvrability of the Imperial Guard (not something I ever expected to say
) will be the decider in my mind.