@Abdullah While the three of them work better at reducing charge density which is more perceivable at static reduction under dry conditions, PQ-10 and Guar HPTC are modified polysaccharides that form a rigid film on hair, while PQ-7 being a copolymer, has more degree of freedom. What I mean is that even though the three are more for dry effect on hair, PQ-7 has a little influence on wet combing as well. Nevertheless, silicones are superior on both wet and dry combing, and can be used alongside (except cationic silicones) or replacing them.