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Difficult question to answer without context. Key thing to understand is a pneumatic system uses a compressor, whereas a hydraulic system uses a pump.

Hydraulic fluid is essentially incompressible, whereas compressed air will fill any volume.

Ask yourself: What is my pneumatic/hydraulic system supposed to do?

How fast should it react and what horsepower is available to drive my compressor/pump? What force do I need at my actuator/motor or whatever the system is expected to power?

Generally, I think pneumatic systems can react more quickly but power density is lower, so if the load is very high a hydraulic system might be better.

A typical shop pneumatic system might only operate at 50psi, whereas a hydraulic system can operate at 3000psi.

Finally, it's also worth thinking about system safety: if a pneumatic component fails, there will be an explosive decompression, but if a hydraulic component fails, it will leak but will not explode because hydraulic fluid does not store energy, it only transmits it.

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