Required specifications for a hydraulic cylinder

[country]

What else do I need to know to compare hydraulic cylinders? See the list below? Thanks

Double/single acting, operating pressure, extended length (eye to eye), retracted length (eye to eye), clevis or eye pin, bore (inside barrel diameter), port size (inlet/outlet), body style, and rod diameter.

 

[DavidJ]

Force applied extending and force applied retracting are a couple I look at when comparing cylinders.