Answer
The proton on the right is more acidic.
Work Step by Step
Both conjugate bases will have the negative charge localizated in a single nitrogen, so ressonance is not the difference.
But, the little alkyl group on the left of thenitrogen, normally gives electrons, so, it will affect the stability of the negative atom.
Since the right nitrogen doesn't have this group next to it, it will be more stable, and the proton that is connected to it will be more acidic.
