With hydraulics if you have a problem with the jacks down you're stuck until the problem is fixed. With gear driven you can at least crank them up manually if there is a problem.
2015 Pinnacle 36FBTS
2015 F250 SD Platinum 4x4 - 6.7L PSD :
Titan 50 Gal. Fuel Tank
Slotted and Dimpled Brake Rotors
Air Lift LoadLifter 5000 Ultimate Airbags with WirelessAIR Controller