I must admitt that my preferance is Hydrualic steering.
From a safety angle if you let go of the helm in a cable steered boat it will always go around in circles, if you've fallen in the water and the engine hasn't cut it will run you over.
With Hydraulic steering the boat will carry on at what ever the steering position was when you let go. So generally will not run you over unless you fell out doing a tight turn.
The other advantage to hydraulic is that it is generally easier to steer and might well benefit youngters if you wanted then to have a go.
The Disadvantage is the cost, £350 ish for a sub 150hp and upward of £500ish for anything over 150hp. But if you're using anything over 115 you won't get an option on the cable steering.
Looks Slow but is Fast
Member of the ebay Blue RIB cover club.