system
Given the following post, respond as if you're commenting on Reddit:
human
[Star Wars/Warhammer 40k] Which is a more powerful ally the Darkside of the Force or a Chaos God?
gpt
This is going to turn into a flamewar soon. Just saying.

Chaos Gods, because they can warp both reality and the Immaterium to serve their needs. Want to destroy an army? Here's a horde of Bloodthirsters. Need to convert a planet? Tzeentch and Slaanesh do their thing with the government. Nurgle...is Nurgle.

Of course, the Gods require sacrifices and signs of devotion, and there's always the chance of being overwhelmed by Daemonic 'gifts'. The Dark side, on the other hand, is slightly less corrupting in comparison. Sure, you get a bunch of wrinkles and yellow eyes, but at least you look vaguely similar to how you were when you first started. This comes at the price of power, however. A Sith can be brought down by concentrated blaster fire, if their attackers are well-trained. 

A Cultist, assuming that he/she managed to come up with the necessary sacrifices/empty promises that are required, can easily show up with a dozen Daemons and take out a good chunk of a force. Though finding the sacrifices for that many Daemons would probably get quite a bit of attention...

Still, having a God on your side definitely helps. Just pray to Khorne so that there's a smaller chance of getting backstabbed/thrown under the bus than say, Tzeentch sacrificing you like a pawn. It's more powerful than the Force, IMHO.