First of all I want to say I don't like We Can't Stop AT ALL and I hate the video but Birthday, both the song and the music video is AWFUL! Selena usually sounds good when they fix her voice with auto-tune, which is good since she CAN'T sing live, but she sounds terrible here. Miley at least sounds good, even though I prefer when her voice sounds natural rather than auto-tune. I think I'm also a little biased because I LOVE Miley MUCH more than Selena, even though I really like her too. However in my defense I was thinking I would vote for Birthday before I looked it up on youtube but man it's AWFUL! Years ago people complained that Miley stole Selena and Demi's youtube video about a Power Ranger shirt (which Miley countered with a Teenage Mutant Turtles shirt) but it looks like Selena stole from Miley. We Can't Stop wasn't even good in the first place but this is even WORSE!

Miley all the way.

Definitely Birthday. I actually really like it. We Can't Stop is...too much. I like the song...sort of, but the video, not at all.

Liked Miley's song better. But I hated the video.