I've got a single humbucker Telecaster made of basswood with a maple neck. I'm looking for a warm, thick hot humbucker. Nothing over the top, because I want it to be able to clean up. My heaviest sounds are Black Sabbath and my cleanest sounds are usually a warm bluesy overdrive. Not a big fan of modern or scoopy sounds. I play mostly rythmn, but sometimes I want to make it cry or sing. Right now it has a Jazz and let me tell you, not my cup of tea. My searches have lead me to 5 options.
The Custom Custom, Tone Zone, and Wolfgang MIA are especially similar if anyone would be able to pick out the differences between them.
I'm kind of leaning towards the Dimarzio and Lawrence offerings simply because of the double creme offerings, but I'm not big on aesthetic if one pickup is leaps and bounds ahead of the other ones.
If you're using heavier gauge strings and tuning this down to C#, then having a brighter pickup is not going to sound overly bright. Also, Iommi's sound was from driving a modded Rangemaster into his amps front ends. It's a unique and dynamic sound that allows you to go from Sabbath dirt to gorgeous cleans with just the volume knob on the guitar, and tbt benefits from interacting with the lower output P90 and Charlie Christian pickups in Monkey.
Tbt any stock HB sized P90 clone and a Keeley Java or Beano Boost with the mode switch will get you there and more.
if you are dedicated to sticking with Humbuckers I would recommend a TV Jones SuperTron or PowerTron. They aren't what most think of as modern hot humbuckers, but are both quite capable of driving an amp's front end hard, have a thick vintage tone that can do heavier vintage styles quite well, but clean up beautifully with the volume knob.
Tbt for what you say you want in tones I would recommend an over wound HB sized single like the Hot Phat Cat or something of that nature. Or if you want to expand the guitars tonal range a lot since it is a single HB guitar maybe a SK Guitar Dual Tone II (splittable P90, A5 single or HB operation selectable via push pull pots), or Seymour Duncan P-Rail.
I had two of the SK Dual Tone II's in a Les Paul for a long time. They're great sounding pickups in all 3 modes.of operation. The P90 coil was my goto bridge tone in that guitar for years, and I could switch it to humbucker when I needed for more saturated sustaining lead tones. Then when you want some if that Tele spank you could switch to the A5 coil for that Fender vibe.
In context that was my guitar for Sabbath, High on Fire, Kyuss, and QOTSA tones in C#-C standard tuning.