The Watchmaker: my fav argument

[John 6IX Breezy]

If it's a theory of neurons then the neuron is the unit of comparison, which favors Cajal.  

One could argue that Cajal's explanation was better, not because of simplicity, but because of consistency within a larger scope of theories, namely, biology's Cell Theory. And yet this approach quickly runs into the problem of induction. Experimentation alone is the only measure of a theory's worth.