It’s easy to write difficult trivia questions.
It’s easy to write easy trivia questions.
It’s difficult to write challenging trivia questions. So of course, they’re my favorite kind.
(What makes a question “challenging”? You can solve it if you think about it. Or at least make a reasonable guess. It isn’t you-know-it-or-you-don’t, at least not instantly.)
A complete quiz blends all three kinds of questions: Easy ones to keep casual players interested, hard ones to reward dedicated trivia hounds, and challenging ones to keep people intrigued and on their toes. I think a quiz without any challenging questions is not a great quiz.