Hydraulics is definatly not unstopable. Just like pneumatics the larger the cilinder, the more force, but also the more weight. The only main difference is the working pressure and the fact you dont vent the material you use to move the piston. You can have a 8 tonne hydraulic crusher, or a 8 tonne pneumatic crusher, both will be just as effective. All in all, there both 8 tonnes.