Of your 2 examples, the right anwer is "CUAL". Generally, you use 'QUE" when you are refering to things in general, and when you wish to ask for a specific group of things you use "CUAL".
For example:
1. ¿Qué película has visto últimamente?"= What movie have you seen recently?
2. ¿Cuál es tu tipo de película favorita?= What is your favorite type of movie?