Thanks to pjbasis for the numbers (corrected the LttP/MM-percentages):
Ocarina of Time - 28337 [95.50%]
Phantom Hourglass - 1334 [4.50%]
Link to the Past - 14375 [49.05%]
Majora's Mask - 14934 [50.95%]
Link's Awakening - 6911 [23.86%]
Twilight Princess - 22056 [76.14%]
Now, for some GameFAQs-polls so you know Epona's games' opponents have legitimate fans:
PH - http://www.gamefaqs.com/poll/index.html?poll=2983
LttP - http://www.gamefaqs.com/poll/index.html?poll=3503
LA - http://www.gamefaqs.com/poll/index.html?poll=3483
It's also worth noting that games with Epona in a major role are going 7-0 this contest unless Wind Waker upsets Ocarina of Time (spoilers: hahaha). This is good news.
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http://img812.imageshack.us/img812/3492/eponaharr.jpg
Nominate E P O N A.