Fiorente, Gai Waterhouse’s 2013 Melbourne Cup-winning superstar, is the favorite for the 2013/14 Australian Horse of the Year, but faces stiff competition to take home the crown after a recent drop in form. Fiorente had a disappointing performance in last Saturday’s Ranvet Stakes, re-igniting debate over which horse should win the prestigious award. Sportingbet Australia has installed Fiorente as the marginal $2.50 favorite, but unlike previous years, there’s a number of other strong contenders. Boban ($2.70), Buffering ($6.00) and Lankan Rupee ($8) all have genuine claims with the Sydney Autumn Carnival likely to determine the front-runner. Earthquake is a $10…