Anyone know?

Illumina hands down

Stock springs: HP will do
Aftermarket springs: Illuminas - they're adjustable

Illuminas are pretty smooth, rode in Illumina + Eibach yesterday smoother than AGX for sure. Only thing is that they tend to bottom out easier than AGX, (i believe they were only on 2F 2R though so that may have been why).

LEMAR

Most comfortable ride with Illumina's, yes they do bottom out if set to soft.