MONMOUTH, New Jersey – What’s your favorite Halloween candy? There are plenty to choose from, but researchers have discovered what the most popular candy is Reese’s Peanut Butter Cups. According to a Monmouth University poll, 36 percent of Americans picked Reese’s, but there’s a catch. The survey only gave people 8 of the most popular candy brands to choose from. Reese’s beat out M&M’s, Hershey bars and candy corn.