Can only recommend what I have direct experience of - Seastar hydraulic!
My dad reckons there are three things you really cannot afford to scrimp on with a car - tyres, brakes and steering - as their operation is essential for safe driving. I reckon the same is true of a boat (but I guess the tyres would be replaced by the hull and the steering acts as a brake too!
IIRC you're getting a brand new big boat (8m ish?) - so why cut corners? You're already spending thousands - what difference would a few hundred quid make?