The Volvo tab is a wedge approach 90 degree straight down from the transom got to produce the most drag which produces less speed at the same RPMs but it also has the smallest foot print for those wanting a bracket which covers most of the transom for additional flotation.
The Lenco system is all electrical meaning the device which causes the tabs to go up and down are in the actuators located in the water Ύ down on your transom if any water gets into the cylinder which only has rubber gaskets to keep it out of the actuator it will need to be replaced Lencos warranty is half as long as Bennetts warranty period and strictly enforced.
The Bennett system is hydraulic mechanical system meaning hydraulic fluid pushed through hydraulic tubing by a hydraulic pump installed in a dry place in the boat causes the tabs to operate Bennetts are known for their longevity as some have stated on this thread. Bennett is also known for their customer service and Free replacement parts if ever needed. Most boat owners will either die of old age ore sell their boats before any parts ware out. Where on the Lenco system many will have to replace the actuators way before Bennetts tabs need to be checked for ware or problems.
FellowShip
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Just for the Grins
Official Antique Classic SeaCraft Owner