Such a easy question
The one that is not generic.
The one that is innovative.
The one that started the dance trend in music industry
The one that destroyed Europe as a 4th single.

Just Dance, my favorite Gaga song ever Vs. Don't Stop the music, one of my least favorite songs from Rihanna... Just Dance

DSTM. Just Dance is generic and got old real fast.

Don't Stop the Music.

Just Dance

This.