Demi is bigger and seems to have stronger biceps so I go Demi.
Miley however might fight dirty and shove a d*ldo up her butt or something to get her off guard and choke a b*tch
Demi is stronger, but I think she's afraid to attack her
While Miley does everything to win it
She'll bite demi, lick Demi's sole ( tickle, decrease attack, right? )
So probably Miley