Capacitor rolling.

When oscilloscopes pay for the gear, I'll let them tell me my values, Until then, I buy what I like to listen to, can afford and can put in my living room without blocking the windows. :)

Having said that, I did in fact choose Clarity for their absolute transparency.

Still, I can see "enriched" caps as being desirable as well.

The poster is looking for warmth. All caps have a sound or personality as does all gear. The Jupiter VT caps are natural sounding with lots of meat on the bones....opposite of thin and bright sounding. Nice resolution, but they deliver the goods with a nice warmth. Perfect for the poster.

The Jupiter copper foil caps are more resolute yet, with more top end extension and air. They reveal Micro details of the music better and do all of this with a smoothness that is both natural and easy on the ears. 

Yes the Jupiter caps are very,  very quiet and well damped just like  Duelund caps. Amazing what the removal noise does for music! 

In my view, it’s technology first, materials second, brand third.

Technology for the best caps, IMO, is either metallized dielectric (e.g. aluminum deposited on teflon), or film and foil (a layer of metallic film and a layer of dielectric). Film and foil is far superior. Then there is air gap, which consists of plates of metal separated by air, but that is limited to small values.

Materials mainly used are aluminum, tin, or copper for the metal, and paper in oil, polypropylene, styrene, or teflon for dielectric. Tin or copper can be soldered, and seem to me to give a smoother sound. Dielectrics seem to affect the sound as a function of dielectric constant: clarity improves as dielectric constant goes down. That puts styrene and teflon at the top.

That said, I find that styrene sounds a little more neutral, and teflon a little edgier. Air gap and vacuum are the very best, but very bulky and very expensive.

Last is brand and details of their process. Thickness of metallization is critical to the sound of metallized caps. More is better, but good luck in finding that information. MIT has a patented method of connection, which makes their multicap line sound better to me. Dueland is very close to an optimal configuration, but you have to pay for it.

I use a lot of MIT Multicap RTX styrene and tin f&f capacitors when I can’t use air gap, as they suit my system and my tastes. YMMV

Good discussion here and as expected different choices of capacitors preferred depending on the particular poster’s taste. Some like to use the term "neutral " and others such as myself use/prefer the term "natural", semantics. Natural is what I seek, in other words,  organic and realism. I’ve had the opportunity to use some exceptionally high quality capacitors. Just my opinion based on listening and acknowledging my opinion is no more or less credible than anyone else.

1.Duelund CAST copper foil.
1a.Jupiter copper foil.
2. V cap tin foil and Teflon.
3. Sonicap Platinum.

This is simply my preference based on perceived natural character. In my opinion all of these capacitors have an innate sonic signature which is unavoidable. Absolute neutrality doesn’t exist. We all choose what we believe best suits our own objective and listening criteria, as it should be.

I won’t argue over what’s the "absolute " best as this is pointless and unprovable. I accept that this is purely subjective by its very nature. One man’s neutral is another one’s thin . One man’s natural is another one’s rich. The debate goes on into eternity. Trust your own ears and you’ll be fine. Accept the fact that others will disagree with you, that’s okay.
Charles