Our book makes a lot of animal references . Seriously though, different people are going to have different preferences as to which book they prefer.
At the moment, there are only two 1Z0-815 books on the market (Enthuware's and ous). I recommend ours because we wrote it ;). Seriously though, Enthuware has great mock exams online for $10. So I would recommend buying our book and supplementing it with the Enthuware mock exams.