In a twist of fate, Epona is here to face off against the Armored Titan instead of Link! This is a pretty lucky break for the Armored Titan as he has enough physical power to win the round. Epona can attempt to evade him for a while with her speed, but the Armored Titan is just too powerful and eventually he would claim victory. Armored Titan wins.
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I know it doesn’t make sense, but Epona is invincible. I don’t think that it’s possible for Epona to ever die, or take damage, and enemies take lethal damage when Epona walks near them. The titan would probably win in a race, but not in combat. Epona can get hurt, and she will make a noise, she can get tired by running out of carrots, but she will never sustain any injuries.
Epona is definitely skilled and I’ve always admired her determination. The Armored Titan has certainly never fought an opponent like her before.