There is debatably a small impact to tone and volume by adding another pickup, even when that pickup is off, because you're basically placing a magnet close to magnetic strings. Although the theory makes sense, I don't see it play out in practice. People should choose based on the sounds they want and the look they want. The bridge pickup is certainly easier to get a classic aggressive "rock" tone out of, so if that's something you want easy access to, you should add a bridge pickup. It's hard to get a neck pickup to sound aggressive, especially on a low tension, short scale instrument like a ukulele. And even more so especially if your neck pickup is slammed right up near the neck - on most guitar designs, the neck pickup is on the bridge side of where the 24th fret would be - on a uke with a comparatively larger body and shorter fretboard, it's easy to unintentionally push the neck pickup further up the scale (relatively) than you intend to.
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