The former, obviously, and through personal experience, is much harder to use than the latter. However, the primary benefit of the manual jack is that it COULD be less prone to breaking since it is a simpler device. The electric trailer jack could fail electrically or mechanically. The electric trailer jack will also require installation or some know-how as far as wiring goes. 
Replaces Dexter Part Numbers: K23-108-00 & K23-181-00. 4pcs Electric Trailer Brake. Assembly Set. 2 x Left Side. 2 x Right Side. 12" x 2" Assemblies. AllLIFT SUPPORTS sold carry a. ONE YEAR manufactures warranty against defect factory defects (not wear & tear), this is a parts only warranty, and does not cover and labor, towing, car rental, or any other expense.
Features: ---Strong Fine Mesh Screen ---12 Volt Fan with 6" Blades --- Extra Strong Galvanized Steel Roof Flange with Mill Finish --- Dimensions 8.5" Round x 1.5" Deep --- Vent Color is White ---Includes 70" of 3/4" Butyl Tape ---Includes 28 screws for mounting the roof vent --- No Garnish Ring --- Will replace existing Elixir or Ventline Products (Please check the Hinge Style before Ordering) --- Standard OEM Dimensions (Opening 13.25" x 13.25") Mounting Flange (16.5" x 16.5").
The cover has worked great. The reason for only 4 stars is that we took preventative measures when it arrived. Many reviews complained about it leaking. We turned it inside out and sealed all the seams. Once dry, we put a plastic bag on first and then this cover. Using both has made a water/weather proof cover to protect the electronics of our power lift. The plastic on its own is not strong enough, adding this cover made the difference.
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