Instead of "What is your favorite actor," say "WHO is your favorite actor." Since you're speaking about a person, use WHO.

I love Ryan Gosling and Leonardo Dicaprio! 

I think Anthony Hopkins is a good, versatile actor.

I love Robert Redford for his looks. (I'm old)

I loved Sean Connery for his voice.

Di Caprio is improving with age.

There are so many...

Aamir  Khan

For me it's Tom Hanks and Helena boham carter the tim burton's wife