My $.02:
When amplifying our instrument, we have two main goals.
1) Maintaining the character and nuance of the acoustic instrument
2) Doing so at higher volumes with a tone that actually works in ‘the mix’
In my experience, choosing a pickup or mic that is best for the #1) doesn’t work too well in the #2) situations.
My approach has been to accept that reality and strive for an amplified tone that is warm and ‘acoustic sounding’, without piezo quack or nasties. Those artifacts are problems common to certain pickups but can be tamed with a high impedance amp (preamp). I’m not a fan of the Underwood, BP100 or other pickups of that era or ilk.
So?
I have a Realist Lifeline on two basses and recently put a Full Circle on my Kay. The Kay had a Realist Copperhead which was OK but I took the FC as payment for some setup work. It is terrible through the GK MB150S, sounding like the worst Ron Carter you ever heard playing through an empty beer can. Really nice through the Clarus set to 10k and Acme B1 cabinet. This setup will work well on the loudest gigs. The Lifeline has worked well on the three basses through the GK, but the FC seems to have a bit of the piezo quack. I might try it with the Fdeck wonderbox.
I don’t play stupid loud anymore but quite often, my gigs have the amp winning out over the acoustic volume.
We all have to figure out what works for us. What gets the tone we hear in our heads out of the speaker cabinet?
P.S. I need an amplified tone that works well when I grab the bow. Don’t want to peel paint or scare cats.
TEHO, YMMV, etc.....