I have no idea who we should be rooting for. Probably neither.
One is a coalition of some of the worst oppressive, dictatorial and theocratic regimes in the world trying to pop up a puppet government with zero public support.
The other are a popular coalition of religious heterodox tribes, through dominated by the Shia group. It's also very hostile to the Al Quada group which operate in Yemen.
Of course the former are western allies and the latter friendly toward Iran. But even with that I prefer the rebels.