Out of AlCl3 and NaCl which is more effective in causing coagulation of negatively charged sol and why?

By hardly schulze rule, for a negatively charged sol, positively charged ion with higher oxidation state is a better coagulating agent. Since AlCl_​3 forms Al³⁺ ion and NaCl forms Na⁺¹ only, AlCl₃ is a better coagulating agent.