Anyone using Airtight ATM 211 to recommend?

I have read a lot about Amperex 211s are the best. What sonic attribute exactly makes them the best? I have gleaned that they are tonally more natural, and have better soundstaging, however, how are they in terms of resolution, midrange, etc.

Also, can anyone comment on differences to expect between the regular Amperex 211D vs the Amperex 211D Brass base?
 

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