Well, I'm not entirely sure I am using the right terminology, but...
Less Ackerman (smaller difference in angle between steered wheels) - sharper steering response, more tyre scrub at speed, depending on the car design you may get a smaller turning circle.
More Ackerman (larger difference in angle between steered wheels) - smoother steering response, less tyre scrub so perhaps carrying a little more corner speed.
Like most geometry things, it is a pretty fine adjustment.
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