Now that I listen to Scream & Shout more, it's grew on me. It's still not AMAZING but I suppose it's decent for a will.i.am song. So I guess Britney was best for that track since I think it's the best of the three, although This is Love was a hit worldwide, I don't see Britney's vocals fitting on that track. And The Hardest Ever was just recycle bin material.
