Difference between a Aurender x100L or N100H

Can anyone tell me what , if any, are the differences between these 2 servers, aside from storage capacity?

Other than the storage, the other significant difference is power supplies.  

N100H has a audiophile preferred full linear power supply. IMO, the Switched Mode (SMPS) in X100L is least preferred in servers due to the high noise and requires proper shielding from nearby electronics.
Linear power supplies also create some amount of noise but nowhere near as much as that produced by switched mode power supplies.

Linear power supplies provide a constant voltage at all times while the power provided by a switched mode power supply constantly varies. A switching power supply operates by constantly switching the source on and off; the rate of which is dictated by the needed voltage at the output.

If storage is not an issue, I would strongly recommend N100H.