Hello. i had a similar topic earlier but I came across some examples featuring those 2 in my Rosetta Stone course. ¿A usted, qué zapatos le gustan más? Which shoes do you like more? ¿Qué camisa te gusta más? Which shirt do you like more? Does the usage have to do with formality? For instance, do you use "¿A usted,...?" to someone whom you don't know and "¿Qué....?" you personally know? ¡Gracias!