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Idk I'm afraid.
I watched a This Morning review of them when I was kid and off ill. The best was the most expensive one that did something in particular, and 2nd was the cheapest manual one which was a bit like a tonk salad spinner and so the speed off the spinner whipped it up more.
My folks is just a slow paddle that pops up when the mix is too thick. You can mitigate it by putting it in the fridge a hour or two before serving.
But hopefully you can find a review or ice cream forum that references that as a feature.
A useful point - is that about churn speed/duration or a factor of the machine itself?