I'd use the only tool we have to sort theories: Occam's razor.
Weed out all the theories that do not match the experiment — keep both in that case.
Sort them by how simple they are.
This is what many do by assuming the second is “over-fitted”; I believe a good scientist would search the literature before stating a theory, and know about the first one; as he would also appreciate elegance, I'd expect him to come up with a simpler theory — but, as you pointed out, some time in a economics lab could easily prove me wrong, although I'm assuming the daunting ... (read more)
I'd use the only tool we have to sort theories: Occam's razor.
This is what many do by assuming the second is “over-fitted”; I believe a good scientist would search the literature before stating a theory, and know about the first one; as he would also appreciate elegance, I'd expect him to come up with a simpler theory — but, as you pointed out, some time in a economics lab could easily prove me wrong, although I'm assuming the daunting ... (read more)