I think it's largely this with pickups. The BKP have a more 'open' sound with better clarity and string separation overall.
I find the Duncans to be 'thicker' and more 'woolly' sounding overall. I find Duncans get muddy fast while BKP are tighter and handle gain extremely well.
Through an amp with a very thick and complex tone (Mesa), the BKP severely kick ass. It's no contest whatsoever. With a thinner and brighter amp, a phatter and thicker pickup like a Duncan may be possible.
I replaced my Alnico II Pro neck and Custom Custom bridge in a single cut mahogany guitar with a Rebel Yell bridge and a VHII neck. With the old pickup setup, I could turn the gain down a lot and get a really musical and smooth breakup because of the mid focus and rounded highs. Switching to the BKP, I found that I had to turn the gain higher to get a phat tone that was pleasing to my ears. Now, I discovered that by turning down the volume knob on the guitar, a similar effect can be achieved to the lower gain settings. Likewise, turning down the gain and re-eqing the amp can also yield pleasing results. At any rate, no tools are perfect for the job but generally, you'll find a way to get the tones you want.
In the end, I can only say that BKP are 95 - 100% best for my own needs as a player. I prefer the tightness, clarity, and expressiveness that they contribute to my playing.
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Absolutely agree - Trying a host of BK's helped me narrow down exactly what I wanted from a PU (as apposed to 'I want to sound like 'X' player'). I had a Custom Custom in an '80's Kramer for years before trying a Riff Raff / Holydiver / Crawler. It now has the original CC back in it because I missed the thick mid range and rounded lead tone - I just didn't know at the time!
I can appreciate the clarity of BK's but love the way Duncan style pickups sit in the mix at any gain level - hence the WCR Murkat.