A little late to the thread but from using a few different ones, I can share some experiences.
It's hard to compare by dial settings on the EK especially on a person by person basis. This not just because of the different dials but also because the type of carrier (prebreaker) makes a difference. The finer threaded augers, such as Turkish and Titus' new CNC'd carrier, have more granularity in adjustment due to the slower feed rate and the fact they're busting the coffee into smaller particles before they reach the burrs. My EK43S had the Turkish auger stock. Looking at Mahlkonig's parts list for the grinders, there is a different part number for the carrier between 60hz models and 50hz models. I can't say with complete certainty, but observationally I think MK is putting the Turkish auger stock in 60hz models since they spin at higher RPM, and the coffee auger in the 50hz models. Of course older models with the steel carrier, Coffee burr equalled coffee carrier and turkish burrs equalled turkish carrier. Basically, if you had someone say in the U.S. or Canada with the old steel coffee auger on a 60hz grinder, they're going to be finer on the dial than basically every other version of the EK43 even with the exact same burrset.
SSP's website is confusing and despite making great burrs he needs a better nomenclature for them.
High Uniformity used to just be "SSP EK43 Burrs". They're a similar geometry to all his other multipurpose burrs such as the Ditting/Bunn/EG-1 burrs. 3 stage, plenty of prebreakers, flatter more shallow finishing section. These are the ones to get for espresso, and they're a good all-arounder in general.
Low uniformity: Haven't personally used, but a friend is testing them comparatively to the High Uniformity. He 100% prefers them for filter over high uniformity and says they give cleaner coffee and the ability for pushing extraction higher on average. When I was talking to Frank on IG and he sent a pic of the lows these were the ones he had pictured (not the ones with Ditting style teeth). Similar to an earlier comment on this thread, where a box with just "Low" on it. Kinda gets back to SSP needing better naming/classification. Can't really speak on their 'Spro ability but they seem to deliver on a more brew focused multipurpose burr.
The Ultra Lows (Ultra Low Fines, Low Fines, depending on what part of his site you're reading) are weird. They have Ditting style teeth, but unlike the Ditting 804 burrs and MK Tanzania burrs, the teeth are extremely shallow, as shallow as the teeth on the high uniformity burrs with a similar dial range as the high uniformity as well. They can EASILY do espresso. That said they have a somewhat broader particle spread (compared to other SSP and MK Cast burrs) and I can't really say they deliver on the premise of fewer fines at all. I think the Low Uniformity ones are the way to go for filter, those and just straight up stock MK cast burrs especially the old style coffee burrs.
Wild Card: I sent new style coffee burrs to SSP to do a regrind and geometry change to the old coffee burr geometry with the deeper finishing teeth/smaller flat section. He did a great job with them and they're doing a stellar job with filter and EKspresso. Just to throw out there that it's an option and a cheaper option than buying new burrs at that.