With all the rumours about the most elite of the elite army the Grey Knights I wanted to know if traditional game-rules wise if they had any advantage against Chaos Space Marines.

I know they get a LOT of anti-Chaos Daemons stuff but Chaos Daemon players in 40k are extremely rare almost next to that mythical Dark Eldar player while CSMs are everywhere. I'd say there are probably 10x more CSM players out there probably all running Khorne Bezerkers

So do and will the Grey Knights get any specific Anti-Chaos Space Marine stuff or will they only be good against real Daemons.