Its been decades since I've owned a guitar with the ceramic crystal Fishman passive piezo pickup. I recall the polymer Matrix and Element, which require a preamp inside the guitar, were a big step up. If it was between what I remember of that passive piezo UST and more recent experience with a K&K, then the K&K is the clear winner.
If avoiding a battery is your issue, then the Mi-Si Trio I use is another option that is competitive with a Baggs Element. It uses a super capacitor that you charge in about a minute for 18 hours of play.
For top dollar, the Barbera Soloist replaces your bridge saddle and is reported to be an excellent sounding pickup that can work passively.
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