Either/Or: "Titanium" featuring Sia or Mary J. Blige?

Mega electro-house producer David Guetta's known for his top artists collabs — Nicki Minaj, Kid Cudi, Kelly Rowland, etc etc etc — so it's no surprise he rounded up these fine ladies to feature on his new single "Titanium". Technically, Sia's version has been officially released, and Mary J. Blige fans are up in arms about the soul queen's version being snubbed. This is where we turn to you, dear readers, and pose the question: who rocked "Titanium" better? 

~ A.H.