Re: Gibson sg pickup recommendation?
Doom's usually fairly easy, tends to be more about fuzz or stacked gain than the pickups, though there are a few iconoclasts who focus more on tone shaping and output at the pickup. All about the pedals and big bassy amps. Big Muff variants [Way Huge Swollen Pickle, Black Arts Toneworks Pharoah Supreme, Proco Rat], or maybe a DOD Carcosa... Or any weird obscure thing you find and like.
Given that gamut, I'd lean towards vintage hot or medium output pickups. SH-5 Custom at probably the punchiest for bridge, '59/Custom Hybrid, '59 Bridge are pretty much the gamut. '59 or Sentient neck would be first things I'd check out. Could also look at a Screamin' Demon in the neck, particularly with the hotter pickups [A lot of people find the standard neck humbucker location in SGs a bit frustrating, something hotter but with controlled lower mids is one of the more common solutions]. Whole Lotta Humbucker set is another good classic humbucker sound. Or to focus more on blues/classic rock, Saturday Night Specials.
I'd suggest trawling around youtube a bit, see which ones grab you.
A lot of the pickup suggestions I and others make are centered on "PAF" humbuckers, because those are the most flexible. Rock and metal-oriented pickups tend to sacrifice dynamics making them less appealing for blues, and be much pickier about what fuzzes they work well with, on the doom side. Though there are more flexible exceptions.
If you want pickups that can do it all, a P-Rails with Triple Shots set might appeal. Tone Zone-ish huge fat humbucking series tone, more light & bubbly PAFish tones in parallel, split to P-90 and a rail single coil. P-90s and parallel are the most obvious choices for doom, anything but series most likely for blues, and anything goes for rock.
There are people who like hot ceramic pickups like the Distortion for blues or other unusual combos, but that's really choosing to fight your equipment...