http://www.humblehomemadehifi.com/Cap.html is a great site for capacitors
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Atmasphere is right--and sometimes the result can be disaster for the circuit. But, of course, the sound you describe "warm with lots of details" is (best/only?) achieved with copper pio caps.
Can't compare the three varieties you list, but I have used the copper Jensen pio in a SET amp for years. The sound is just as you describe, and the caps have proved trouble-free.