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. 
14-1/2" x 17-1/2" Weatherproof cover slips easily over your electric tongue jack and secures with drawstring. Helps to protect jack motor from the elements. Fits Ultra-Fab Odyssey and most Features: Weatherproof cover protects your electric jack from dirt, grime, and inclement weather when not in use Slips over top of jack to cover motor assembly, switch and/or light Drawstring runs
RV, Marine LED Porch Light, New LED Rectangle Porch Light Without Switch Free Shipping, Ships Same Day Or Next Business Day ---LED Rectangle Porch Light Fixture 220 Lumens, with one clear and one amber lens. ---Made with Environmently friendly technology and materials. ---Wide Voltage Range : 11-18 volts ---Applications include 12 Volts DC recreational vehicles. RV fluctuations can damage a regular LED. This LED is designed to withstand a wide operating voltage range. ---Beam pattern : 120 degrees ---6" w x 3 5/8" x 1 3/4" ---BRIGHT: 220 Lumens ---Color Temperature : 6000-6500K, Cool White ---24 High power 2835 LEDs. ---2.7 Power Watts ---60,000 hour life expectancy. ---Lasts many times longer than standard light bulb. ---In stock.
Features: ---Strong Fine Mesh Screen --- Extra Strong Galvanized Steel Roof Flange with Mill Finish --- 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 --- Standard OEM Dimensions (Opening 13.25" x 13.25") Mounting Flange (16.5" x 16.5") Power Vent Options Available (Visit our store for the listing) * Garnish not included.
This fits nicely on our travel trailer power jack. We purchased it to stop the sun fading the black jack. Although we purchased and started using this a couple months ago, after days of heavy rain here recently we thought it would be prudent to check under it today. Yes, it is not waterproof BUT it was only damp under there and all the electronics still worked so we were happy. Let's face it, the manufacturers make the jacks to be weatherproof so a bit of water/damp should not hurt them. I do like another reviewer's idea of putting a plastic bag on first and then putting this cover on top though. A great idea!
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