AN Niobium versus Tantalum resistors?

 in the end you are the chef and season to your own taste..

Yes but it is like asking the comparison of two of the same herbs - I had this problem recently with oregano. One brand was so sharp and bitter I could not find any place for it whatsoever. I think its possible to talk about the intrinsic qualities of a component irrespective of where you put it, like comparing 3 oregano on their own.

Decided to try Z-Foils on the input signal coming into the amp, and then Niobiums in the feedback position which seem to exaggerate the color of whatever is used in it. AN is finally sending them my way.

As for silver Tant/Niobium : I cannot stand silver or rhodium in my system because I like the warm fundamentals which always seem to vanish with the slightest rhodium component, so I am fearful of trying these, but I heard they may be different. They are expensive to try.🤔

well. it appears you have taken the plunge. Will be intrigued when you report back..

I added the Z-Foils first. This is for the resistor which the interconnect immediately connects to, so I decided to make this transparent. The Niobium will go downstream in a feedback circuit.

First impression is surprise. I was told the Takman create artificial junk on the highs which exaggerate dynamics (reminds me of WBT), and sure enough this is true! Overall, a feeling of going from a cheap camera lens to a Zeiss or Leica. Pure, uncolored, rich and deep. Noise floor radically dropped over the Takman REY, and those were radically less noise than the REX or generic metal. Resolution increased nicely. No color whatsoever, like looking through high-grade glass. It is nice for my application! These seem good anywhere you do not want the resistor to exist, so to speak. Filling an entire system with these would be odd unless you were totally confident on all other components. 

There is some burn-in going on, so I will take them to 2-300 hrs and then add Niobiums. Obviously AN are aware of the Z-foils, so I am expecting the same but  maybe more humanity or color, maybe tuned toward voices or acoustics.