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QUICK ANSWER
"Quien" is a form of "quien", a pronoun which is often translated as "who". "Los que" is a phrase which is often translated as "the ones that". Learn more about the difference between "quien" and "los que" below.
quien()
A pronoun is a word that stands in for a noun (e.g., she).
1. (relative)
2. (indefinite)
a. anyone
Puedes elegir a quien quieras siempre y cuando levanten la mano.You can choose anyone you like as long as they raise their hand.
los que
A phrase is a group of words commonly used together (e.g., once upon a time).
a. the ones that
¿Ves esos trofeos? Son los que gané el año pasado.Do you see those trophies over there? Those are the ones that I won last year.
b. the ones who (people)
Mario y Armando son los que organizaron la fiesta.Mario and Armando are the ones who organized the party.
