flapbreaker-
DO READ the thread Marty lists above, as it is very enlightening!
Short and to the point read follows:
The Permatrim-
has more surface area which ='s more of the desired effects.
is longer, making for a longer lever arm, and making the boat act more like a longer boat.
has downturned sides, channeling the water better on the fore-aft flow for steering assist and containing the water under the foil more tightly, enhancing the effect of the plate in general.
is made up of stout aluminum alloy, not flexible plasic, making it work better.
lacks narrow tips on the outside, making it less likely to trip on tight turns and affect handling negatively.
All IMHO.
Joe.:teeth