I like how Ri is the aggressor and Brit is more subtle sounding fits the S&M motif perfectly
YES! I never thought of that, but you're exactly right. Rihanna has the rough, deeper voice. And Britney has the softer, more feminine. I think they sound perfect together on a song. I just wish it was a new one.
I can't at all the Britney shade. People saying S&M is out of her range when Rihanna and Britney both have the same range. It's obvious that Britney's vocal in this song is purposeful most likely for further differ between the two tracks because there isn't much else that is different for the remix. Why do people want a duplication of Rihanna's vocals? The whole purpose of a collaboration is to add a different element to a song. It's supposed to differ in some way from the original. Britney adding another, softer part to the song is likely the entire point. The remix makes the song a lot better to me and makes is stratospheric, I didn't like the song before other then the bridge so I love Britney taking over that part. I think their voices blend very well in the end.