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In my opinion, silicones leave a noticeable, smoother feel than polyquaterniums do.But most silicones need expensive solubilizers, or complex suspension procedures.https://chemistscorner.com/cosmeticsciencetalk/discussion/5545/how-to-suspend-dimethicone-in-sles-based-shampoosWhile polyquaterniums just need to be poured in and mixed.
Polyquat 7 and Polyquat 10 are commonly used ones. Keep in mind that 10 is derived from hydroxyethyl cellulose which is a thickener. If you see lumps in the finished profuct just leave it overnight.