cables stretch, have a lot of pulleys etc. Hydraulics are simple, powerful. Fast. Electrics have many different ways to work, all are a rack and pinion gear design either in a 2 point under floor or a 4 point top and bottom design.
Fit and tolerance of gears is critical to longevity, as is the material they are made of. Lippert 4 rack top and bottom racks are aluminum. Longevity? wear? a few cycles.
Cables and electrics are mechanical, subject to wear.
For hundreds of cycles you choose. Threads of problems with slides abound around cables, my threads deal with electric RBW gear systems.
For lifetime use and dependability hydraulic is the only choice. Nothing to fail or left to installer or builders mis alignment as was our$$$ gear issue.