I can't decide at all. Jade Fang would be super awesome but the two giant snakes on her head make it so much worse than it should be. I honestly think I might go with Mythic. Although Siren is still really nice for how cheap it is.
But, as always, I must refer to GameFAQs for my decision making, because clearly that is the most wise course of action.
"If they came to hear me beg, they will be disappointed."