I don't know if this is particularly useful, but I've been back-to-backing the Ricta Cloud 92 (56mm) and the Dragons (55mm) for the past few weeks both in the streets of London and bombing hills and cobbles in Switzerland and hopefully can provide some insight.
Clouds provide a better, more consistent grip. I can hold on to harder turns a bit longer without sliding, especially on rougher ground and they do still powerslide pretty consistently, but I have had times when the wheels grabbed randomly. On some slappies etc. i didn't have too many issues with sliding but they are definitely a soft wheel. They feel softer than the dragon both when popping and landing but they also still work fine for street tricks, I don't find them super bouncy but they do absord some of the pop. If sound bothers you, they sound much softer than the Dragon too, they are also MUCH slower on smooth surfaces.
By contrast, Dragons don't feel like a soft wheel to me. I have always preferred a wheel more in the 97-99 range even for street/park back when I was actually a semi decent skater. In terms of bounce/pop etc, the Dragons feel more like those wheels than a cruiser, but they do absorb a ton of vibrations from rough ground. They slide faster and more consistently than the Clouds, and roll MUCH faster on solid ground.
I wouldn't go so far as to back the claim that they slide like a 101 and handle rough ground like a cruiser wheel, that is marketing nonsense. However, they do probably 'feel' like a ~97 wheel in the park and on tricks, and at the same time, they handle rough terrain more or less as well as the 92a Clouds. There is more vibration/feedback from the board but they actually roll just as well.
Essentially, while I think the difference is overstated (Clouds actually slide ok and you can do street tricks, they aren't terrible) there is no reason to ever buy any other wheel in the ~90-95a range because the Dragon is so much better for proper skating while being just as good for cruising around. It's annoying they only offer the V1 shape in 58mm but I will swap my Clouds out for a V6 56mm Dragon as soon as I can find a set at a decent price. Once you drop down into the mid-80s duro range you are getting a wheel that rolls better, but if you ride street spots anywhere in Europe (outside of plaza countries) and actually push around the city, I would argue the Dragon is probably the only wheel worth buying. Maybe if you have young legs the Bones X Formula would be better, but for most, the Dragon is worth the hype.