Even though i just saw it a couple of hours ago, im gona have to go with Deja Vu, shes really coming back strong this time around, and the video was perfect for the song.
I'll say Deja Vu because of the comeback and the fact that it's a very energetic and moving video. But I agree with Chad that MM&I is also her best because of what he said.
The video had a point/storyline. Something all of her other videos lack.
Plus the song required some vocal talent, also something the others lack.
Not every video must turn into a movie so you can get the point of the song. The song is simply about having deja vu and the video came with the topic of the song. You can get the point of the video from her eye closeups alone.
The video is totally different and it's away from the usual club/street scene that we are used to. Which is something all of her other videos lack.
and the song does have powerful vocals too.