The correct answer is Saruman. Why? Well, it is a well known fact that Yoda is a vegetarian, so the third answer is null and void. Between Janeway and Saruman, the white wizard has the upper hand for two reasons: magic and science. Meaning that Saruman could use a spell and make it considerably easier for him to conjure frogs and bring them to him than Janeway's tricorder ever could just by scanning. Furthermore, Janeway, as a scientist, would most likely be so enthralled by studying the planet that she would like be distracted, thus giving Saruman the clear win.
Ultimately, though (as with all my polls) Al Gore remains the true winner.