It's so weird how that can happen to dirt pedals. I've wondered what causes some to get muddy and some not, but then also how like you said some can maintain clarity regardless. Is it just component values, circuit design, component quality? IDK, but would love to learn more about electronics, audio, and circuit design one day.
If I knew that stuff, and had the ability to solder well at all, I'd have ALL THE PEDALS.
Short version of what happened - did a massive fuzz shootout. Pharaoh Supreme won out of the EHX Green Russian Reissue, Russian Pickle, Musket Clone, Swollen Pickle, Pharaoh Supreme, and Grey Stache.
#1 Pharaoh Supreme - No surprise for anyone who's noticed my affinity for the Pharaoh that it came out on top. Changed from MOSFET to Germanium diodes, upped the fuzz, slightly tweaked the pre, and adjusted volume as necessary, and it was similarly warm and fuzzy as my Russian Pickle, but with a more balanced tonal spectrum and less compressed lows. It was also a bit more articulate. It will continue to live on my #1 board.
#2 Swollen Pickle - Replaced the Grey Stache as #2. More of a full spectrum tone, very similar to the Pharaoh, but with slightly more compressed lows and maybe a touch more distortion (on my preferred settings trying to match the Pharaoh). As usual, lots of tweaking, but basically put filter and gain at about 10:30, scoop maxed, crunch at about 10:30, and volume as needed. Can't remember what the internal controls are, but I didn't touch them. It's going back to my #2 board.
#3 & 4 (Tie) Russian Pickle and EHX Reissue - Definitely more compressed lows, and a bit of a scoop, but super easy to dial in. Great for a quick fuzz to just get the job done, and sounds amazing for being so simple. The Pickle has slightly less compressed lows, a bit brighter, and requires more on the volume knob (for identical tone on each pedal). But both are so similar tone-wise and have plenty of travel left on any of the knobs you should be able to get pretty much identical tones to either. Overall I have a very slight preference for the Pickle, but both could get the job done no problem. The Pickle will likely go to my dual purpose guitar/bass practice board I'm working on (as well as some other Way Huge offerings. LOVE that company!).
#5 Grey Stache - This was a surprise to me, as this was my #2. It went down a good deal on the rankings! It came down to flexibility. This thing can CUT - no doubt. But I couldn't get the combination of fuzzy warmth in the lows and enough highs to cut out of it that I could with the others. I could get one or the other. It seemed almost flat in comparison. Still, a very competent muff, and if you need gain, this has it in spades. I never went above 9:00 on the gain, and had plenty of dirt. I've found I prefer lower gain muffs, so this doesn't surprise me. I typically had it at minimum tone and gain, with mids from noon to 3:00, depending.
#6 Musket Clone - Another surprise. I really liked this one, but as a fuzz, it was underwhelming. I could get this to really cut as a tight distortion, but whenever I'd boost it, it got muddied no matter the settings. When I upped the bass to make it fuzzier/looser in the lows, it seemed so compressed everywhere else in the spectrum it was a big shift from the tone of the lows to the highs. Seemed kinda jarring for what I wanted in a fuzz. This can definitely do all sorts of tones the others can't, but I have other pedals I prefer for my distortion needs. This isn't a knock on the circuit, but just an observation.
Hope this is interesting to at least someone out there!