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. 
I spoke to my contact at Lippert Components (LCI) and they informed me that the jack will perform best in cold weather when it is properly lubed and cleaned. To clean the jack I recommend using a brake parts cleaner and spraying down both the drop leg and gears within the head of the unit. Once these two components have been cleaned you will need to acquire some lithium grease like part # L10307 and apply that to the gears on the trailer jack. Once you grease the gears on the unit you...
The shipping weight of etrailer's Electric A-Frame Jack w/Footplate, # EJ-3520-BBX, is 25 pounds. This jack has received great reviews from our customers stating that it is well made easy to install. We don't put our name on just anything, so you can rest assured that this jack is good quality at a fair price. To protect your jack from the elements when not in use, I recommend the Ultra-Fab Protective Cover, # UF38-944020. 

Jack Skellington's empty eye sockets and stitched-up grin can be scary, but "Nightmare Before Christmas" fans know he's a fun-loving guy. Show who your favorite character for installation Specs: Fits 1-1/4" x 1-1/4" and 2" x 2" trailer hitch receivers Face measures 4-1/2" wide x 4" tall 1-Year warranty Hitch covers are fun to show off and they look cool,
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.
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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