We have four electric
winches -- they are great. Foolproof and reliable. The entire system (that is, each winch) is contained in one compact unit, so no chasing all over the boat in case you have some problem.
We have a hydraulic lifting transom. Already had problems with the hydraulics in the first year. Fixed it myself, but it was a messy and unpleasant job. The whole system is way too complex for the job, in my opinion.
Sailed on a big Swan with hydraulic everything. It all worked fine while I was on board, but it made me nervous. The windlass
and bow thruster were powered off a hydraulic pump driven mechanically by the genset motor
. How many things to go wrong there??!! If you can't start
the genset, you are stuffed! Not to mention all the other possible faults.
Hydraulics = great in theory, much less great in practice.
I agree with the above advice -- have a robust 24v electrical system
and use electric-driven systems wherever possible. A little less efficient but SO much simpler.