Well it all depends on the cardssuch, but at the moment (and I mean at the moment) it seems Khorne is getting lots of good stuff, while Tzeentch is getting shafted (you can ask Slaanesh what this means).
We've played about 15 games of CitOWTzeentch has won ONE game. Even the Old World has won twice.
While I agree that the gods are all balanced - Tzeentch is always near winning but has so far fallen shortrun out of steam for some reason - Tzeentch seems to be the one that needs special attention (and please don't ask Slaanesh what this means) to be more competitive. Khorne has been doing A-OK in all of our games, while Nurgle is probably the most feared god.
Intriguingly, Khorne, NurgleSlaanesh are almost equal in their winning rates in our games. Despite all of our presuppositions"Nurgle wins every time" comments. I'm interested to see how the Horned God stirs the pot.
I think every group must play different, because in my groups games Tzeentch does quite welloften times scores a VP win. I think a big victory point tactic for Tzeentch is to upgrade the cultist to carry warpstones then start ruining regions almost at will (4 Cultist + 3/4 warpstones = 7/8 corruption) particularly when you combine it with the Chaos card that causes summonings to cost an extra 2 in that region.
What I think is going to happen with the Horned Rat is that TzeentchNurgle will have to start pulling out their warriors inorder to keep the skaven at bay, relaying on Khorne to be your rat catcher would only result in a dial-victory for the Blood God. Slannesh might also feel the heat because droping skaven tokens in regions with crowns will be very attractive.