Re: Gibson 57 Classic vs Duncan 59?
My experience with the '59 is as a neck pickup in my G&L ASAT Deluxe; 250K pots and a coil split, with a TB-4 in the bridge. I have '57 Classics in my chambered CS Les Paul Elegant, and my ES-335s. I also have the '57 neck/'57+ bridge set in my two 2007 GOTW Classic Antique Les Pauls. My Number One guitar though, is a G&L Legacy; I play through a Mesa Mark Series amp in a G/B/K/D cover band.
I find that for our "soft-rock" gigs or places where I might have an older crowd, the guitars with the mellow '57 Classics work very well. On the more ROCK gigs, I prefer to use one of my historic LPs with the BB 1 & 2 pickups--they have a little more edge to them. BTW, to my ear, the TB-4 and the '57 Classic+ sound very similar, with some mid-range emphasis and a "rock" attitude.
In comparison, and admittedly--these are very different guitars to compare--the '59 in the ASAT Deluxe is less warm, slightly more top end, more articulate and defined than what I hear from the '57 Classic. In some ways, the '57 has a definite character, rounder and "muddy" if you will; while the '59 sounds almost bland in comparison. That could be a good thing, or a bad thing, depending on your taste. FWIW, I doubt that I'll be changing ANY of the pickups in these guitars.
I hate using the word "better" when describing pickups--its all about one's taste, and finding something appropriate for the guitar and the musical situation. And then there is the issue of how the pickup reacts with the amp--a solid-state modeler is going to be different than a Fender, or Marshall, or Mesa or a _______ . A prime example of mine is the 496r/500t sets in my two LP 1960 Classics--they just had too much output for my Mesa amps, but I did like the tone. I think they would be great for pushing a NMV amp, like a BF Twin or old Marshall...but not my Mesas. I replaced them in one guitar with Antiquitys, and the Musician's Friend 50th Anniversary A2 Seth Lovers n the other guitar--and couldn't be happier.
Sorry, I won't claim any real expertise, but I hope my experience is helpful to you.
Bill