Mary J. Blige recorded her vocals for David Guetta’s Nothing But The Beat track “Titanium”, but for some undisclosed reason, Guetta instead went with a version featuring Aussie singer-songwriter Sia for the final cut of his album. Why? We don’t know. And honestly, we like them both. What could have led Guetta to go with Sia’s take over Mary’s, particularly since, with no offense to Sia, Mary is the more well-known artist? While we’re waiting on that one, listen to both versions below and tell us which one you prefer.

David Guetta feat. Sia – “Titanium”

David Guetta feat. Mary J. Blige – “Titanium”

Sia’s cut made the album — but which one do you prefer? Tell us below.

[Via Music & Lyrics]