Certainly a wide open question. Ask 3 detailers their opinion and get 6 different answers. FWIW, some of my favorite LSPs in no particular order.
AF Illusion, AF Spirit, Celeste Dettaglio, DDJ Light Fantastic, Chemical Guys 50/50, P21s, Collinite #845, Optimum Spray Wax,
Synergy, Pinnacle...