It's that simple. You don't know anything about either of the movies, or anything. Just base your answer on the types of movies they've done in the past. Give a reason or two why you chose which one.

I choose Colin Farrel because of The Recruit, SWAT, and Minority Report. They are 3 quick movies off the top of myhead that I can honestly say, IMO, are better than any movie Jolie has been in, at least plot line-wise.