You don't have the slightest idea what you are talking about. Prager is as sharp as they come and methodically destroys idiot liberals like Mike Farrell that are foolish enough to debate him in public. You must be confusing him with somebody else.
The difference between Prager and Coulter is that when Prager finishes destroying a liberal idiot, the liberal never realizes he's been taken out.
Sorta like putting the frog in boiling water (the Coulter method) vs. putting the frog in nice cool water and turning on the heat (Prager method).