[Cuog]

I think that everyone means that it will be smoother(if u want it that way) with hydrolics, with air its very fast and harder to control accurately.

To me it think i would need to know more about the kind of motion you want, it you want it smooth and undeniable but still very flexible(in options) then go pneumatics,

if you want insta-action that is giving but sometimes "mushy" then go pneumatics the choice is ultimately up to you.