Obliterators without
MoN are 60pts of 'dead to a Lascannon'. As a Nid Player, I don't play Warriors for the same reason so I'm a bit overly scared of S8+, but still. I'm not going to trust a 5++ to keep a massively expensive model safe.
My vote is for Night Lords, specifically for a
CAD. Raptors with Obj Sec is a bonus that
CSM can really use, and since we're talking a secondary, that's all I'd use them for. They're not potent enough for me to swap out a Death Guard or generic Renegade primary, but they are a useful tool in the box.