I don't know that there is a hard and fast rule, but I have always wired under the principle that any noise or interference would be heard more in lower level signal and result in a lower S/N ratio.
Unless you are referring to a passive preamp, the shortest to longest order following the level of the signal would be:
Phono
Line level sources
Preamp (active with gain)
There are certainly other factors such as source/input impedances and cable inductance/capacitance, but with most having an unruly gaggle of signal and power cords, some shielded, some not, that is the method to my madness.
Steve