We have both electromechanical and hydraulic linear drives. The electromechanical drive is quieter, uses less power
and produces less drag on the steering
system when not engaged.
For equal size, hydraulic drives typically provide greater thrust but lower torque while using more power
than electromechanical. The hard-over times on some hydraulic units are quite long in comparison to electromechanical, but equal or even shorter for others. This seems to be manufacturer-specific.
Hydraulic linear drives are available for larger boat
sizes than electromechanical. Your boat falls in the high end of electromechanical, but not over the specs of the larger ones. Whatever drive you get, you want your boat to be lower in the drive's recommended spec range rather than higher.
Hydraulic linear drives are typically perceived as more robust, but this is mostly just perception and not reality. Raymarine
has had their electromechanical drive out there for many decades with very few failure complaints - and most of those on 20-30yr old units. For all drives, the key to robustness is bullet-proof mounting, keeping them dry and providing good electrical