Hydraulic steering is generally lighter than cable, but that is partially due to most recreational units being a greater number of turns lock to lock.
In my opinion, the lesser amount of maintenance, and the ease of recovering from a lack of maintenance makes hydraulic a pretty solid choice, if the initial expense doesn't rule it out.
Cables need to be lubed up every so often, and seem to have a tendency to either completely jam up or break just before a big well-planned trip.
Hydraulics will go through seals every now and then, but in most cases, they're neither too expensive nor difficult to replace. Just keep an eye on fluid level every so often, and the helm will tell you when things need attention.
That said, hydraulic is usually quite a bit more of a wallet hit than cable; price out the two and see what fits your situation. For me, unless I absolutely couldn't afford it, it's hydraulic.