We all have favorites: something we prefer over other things.
That said, it is absurd to ask someone (usually famous or well-known) about his or her favorite book, film, food, hotel, actor, etc. A normal person will have several of each, which he or she has enjoyed/enjoys/will enjoy again.
The only instance, where someone must have a single favorite, occurs when a Republican politician is asked about "favorite book". He or she is required by the Constitution/Bill of Rights/Emancipation Proclamation/Supreme Court/Ronald Reagan/Fox News/who knows to utter a common answer: The Bible. It does not matter that he or she does not own, has never read, or cannot not quote said book.
But, for normal people, single selections of any category make no sense. I have enjoyed several films and could make a list of favorites. Some I can watch over and over (Love Actually); others I liked the first time, but that was sufficient (The English Patient). I enjoy many varied cuisines (not Indian). I visit a restaurant in France once a year (Auberge de L'Ill), but I also rate others around the world. There are several authors that I read (John Le Carre, Sebastian Faulks, Alan Furst, Somerset Maugham), but I also read a wide variety of authors and subjects.
My tastes might be called eclectic...but I know what I like (and, what I don't like).
Prior to writing novels, the author enjoyed a multifaceted career: from decorated combat aviator to advertising professional to global communications director of a major consumer brand. He has traveled the world and met sports, film and television stars, political leaders, and royalty. He graduated from Middlebury College, is married, lives in Germany, and has two grown children.