Interesting comments from Gary and all. A few techie notes:
Film resistors tend to have much higher bandwidth than WW; makes me wonder if the WW resistors are rolling off the highs a bit more and taking the edge off.
Metal film resistors tend to be noisier than carbon film but of course everyone knows metal film are "best".
Before anyone yells, in this application it doesn't matter.
The "non-inductive" WW resistors tend to be bilar or multilayer wras so the inductance is cancelled. What they are not saying is that capacitance is thus highre, leading to lower bandwidth. This can be a plus if your are trying to tame a hot high end.
I am not sure what "non-magnetic" means in a resistor; few resistors have significant magnetic properties.
Interesting thread... - Don